Wikipedia:Articles for deletion/Hakkō-ryū
It seems the no proper search has been performed as required per , and a look in Japanese Wiki reveals plenty of sources in Japanese. A quick search for books on the subject also give sources in English - https://www.worldcat.org/title/secrets-of-hakkoryu-jujutsu-shodan-tactics/oclc/21375358&referer=brief_resultshttps://books.google.com/books?id=EtYBAAAACAAJhttps://books.google.com/books/about/Secret_Nidan_Techniques_Of_Hakkoryu_Juju.html?id=C6wIAAAACAAJ&source=kp_book_description&redir_esc=yhttps://books.google.com/books?id=Pl1DswEACAAJ&dq=Hakkoryu+Jujutsu&hl=en&sa=X&ved=0ahUKEwiKz_K4463dAhWOa1AKHWKVCdgQ6AEITTAJhttps://books.google.com/books?id=GJDfjgEACAAJ some of which are also listed in the article as sources. Should qualify under  or indeed 
— User:Hzh, 11:07, 9 September 2018 (UTC)
Stance: keep
Cited policy: WP:BEFORE||WP:GNG||WP:MANOTE (Wikipedia:Articles for deletion)