Title: Fifty Shades of Grey
Content: Fifty Shames of Earl Grey by Andrew Shaffer ; Fifty Thousand Shades of Grey by British YouTuber and author Stuart Ashen. The title is literal, as the book simply consists of the phrase "Shades of Grey" repeated 50,000 times. 
Title: Fifty Shades of Grey
Content:  thing... Good on her—she's doing well. That's great!" This reworked and extended version of Master of the Universe was split into three parts. The first, titled Fifty Shades of Grey, was released as an e-book and a print on demand paperback in May 2011 by The Writers' Coffee Shop, a virtual publisher based in Australia. The second volume, Fifty Shades Darker, was released in September 2011; and the third, Fifty Shades Freed, followed in January 2012. The Writers' Coffee Shop had a restricted marketing budget and relied largely on book blogs for early publicity, but sales of the novel were boosted by word-of-mouth recommendation. The book's erotic nature and perceived demographic of 
Title: Grey: Fifty Shades of Grey as Told by Christian
Content:  Grey: Fifty Shades of Grey As Told by Christian, also referred to as Grey, is a 2015 erotic romance by British author E. L. James. It is the fourth installment in the Fifty Shades series, which had its start as fanfiction. The novel was released on 18 June 2015 to coincide with the birth date of the character Christian Grey. The work's first printing run consisted of 1.25 million copies.
Title: Between Shades of Gray
Content:  Avevano spento anche la luna, Garzanti Libri, ISBN: 978-88-11-67036-0 ; Japanese: "Between Shades of Gray", Iwanami Shoten, ISBN: 978-4-00-115651-5 ; Latvian: "Starp pelēkiem toņiem", Zvaigzne ABC, ISBN: 978-9934-0-2238-8 ; Lithuanian: "Tarp pilkų debesų", Alma Littera, ISBN: 978-9955-38-964-4 ; Macedonian "Крадци и проститутки," Sakam Knigi ; Persian: "Between Shades of Gray", Morvarid ; Polish: "szare sniegi syberii", Nasza Ksiegarnia, ISBN: 978-83-10-11983-4 ; Portuguese (Brazil): "a vida em tons de cinza", Arqueiro, ISBN: 978-85-8041-016-7 ; Portuguese (Portugal): "o longo inverno", Bertrand Editora/Contraponto, ISBN: 978-989-666-085-7 ; Romanian "Printre Tonuri Cenusii," Epica Publishing House ; Serbian: "Putovanje pod zvezdama", Alnari, ISBN: 978-86-7710-729-1 ; Slovakian: "Medzi odtieňmi sivej" Ikar, ISBN: 978-80-551-2442-1 ; Spanish: Entre tonos de gris, Ediciones Maeva, 2011 ISBN: 978-84-15120-25-4 ; Swedish: "Strimmor av hopp", B/Wahlstroms, ISBN: 978-91-32-15958-9 ; Turkish: "Gri Gölgeler Arasında" Delidolu, ISBN: 978-605-63326-7-8 ; Ukrainian: "Поміж сірих сутінків" Klub simejnoho Dozvillia, ISBN: 978-617-12-1888-8 
Title: Grey: Fifty Shades of Grey as Told by Christian
Content:  Fan reception for Grey has been positive and the book sold over 1 million copies in its first week of release.
Title: Stuart Ashen
Content:  In November 2015 Ashen released the book Terrible Old Games You've Probably Never Heard Of, a collection of textual reviews of poor retro games, released through the Unbound crowdfunding platform. The book reached its funding target in 12 hours. On 24 February 2017 Ashen announced a sequel to Terrible Old Games You've Probably Never Heard Of, titled Attack of the Flickering Skeletons: More Terrible Old Games You've Probably Never Heard Of, again through Unbound, was released on 2 November 2017. Ashen released the book Fifty-Thousand Shades of Grey on 23 September 2012; it parodies the popular erotic novel Fifty Shades of Grey. The title is literal, as the book simply consists of the phrase "Shades of Grey" repeated 50,000 times. A 25-part audiobook of the parody was recorded and released on YouTube.
Title: Between Shades of Gray
Content: Czech: "V šedých tónech," CooBoo, Albatros Media A.S. ; Chinese: "Between Shades of Gray", ChinaCITIC Press, ISBN: 978-7-5086-3344-2 ; Complex Chinese: "Between Shades of Gray", ISBN: 978-957-10-4896-3 ; Croatian: "Pomrčina srca", Znanje, ISBN: 978-953-324-532-4 ; Dutch: "Schaduwliefde," Moon, 2011 ISBN: 978-90-488-0901-1 ; English (Australian Edition): "Between Shades of Gray" Penguin, ISBN: 978-0-14-320541-8 ; English (UK Young Adult Edition): "Between Shades of Gray" Puffin, ISBN: 978-0-14-133588-9 ; English (UK Adult Edition): "Between Shades of Gray" Viking, ISBN: 978-0-670-92085-3 ; Estonian: "Hallaaegade algus", Tammerraamat, ISBN: 978-9949-526-18-5 ; Finnish: "Harmaata valoa", Wsoy, ISBN: 978-951-0-37239-5 ; French: Ce qu'ils n'ont pas pu nous prendre, Gallimard Jeunesse, ISBN: 978-2-07-063567-2 ; German: Und in mir der unbesiegbare Sommer, Carlsen Verlag, Hamburg, ISBN: 978-3-551-58254-6 ; Greek: "Between Shades of Gray", Psichogios, ISBN: 978-960-496-478-9 ; Hebrew: "Between Shades of Gray", Miskal, ISBN: 978-965-545-605-9 ; Hungarian: "Arnyalatnyi remeny", Maxim Konyvkiado, ISBN: 978-963-261-204-1 ; 
Title: Fifty Shades
Content:  The original trilogy, Fifty Shades of Grey, Fifty Shades Darker, Fifty Shades Freed, have been published as an omnibus edition called the "Fifty Shades Trilogy".
Title: Fifty Shades of Grey
Content:  the quality of its prose generally seen as poor, while its portrayal of BDSM has been targeted for criticism from a variety of perspectives. Universal Pictures and Focus Features produced an American film adaptation, which was released on 13 February 2015, and also received unfavourable reviews, though it was a box office success. The second and third volumes of the original trilogy, Fifty Shades Darker and Fifty Shades Freed, were published in 2012. The trilogy had sold over 150 million copies worldwide by October 2017. A version of the novel from Christian's point of view, Grey: Fifty Shades of Grey as Told by Christian, was published in June 2015 as the fourth book. Darker: Fifty Shades Darker as Told by Christian, published in November 2017, is the fifth book in the series.
Title: Shades of Grey
Content:  In a 2009 interview, the author mentioned two further books in the series. The titles Painting by Numbers and The Gordini Protocols have been suggested; however, neither is scheduled for publication. In February 2021 Jasper Fforde announced on twitter @jasperfforde that "In March I start work on Shades of Grey II, which should be published 2022. Now, those pesky swans.."

Question: what are the three fifty shades of grey books?
Answer: Fifty Shades of Grey.
Fifty Shades Darker.
Fifty Shades Freed.