Coba jelasin Lihat juga dari Penny Black dong

Prangko dan sejarah pos Britania Raya

Jackson, Mike. May Dates: A survey of Penny Blacks, Twopenny Blues, Mulreadys and caricatures used during May 1840. Melton Mowbray, Leicestershire: Mike Jackson Publications, c1999. .

Litchfield, Percy C. Guide Lines To The Penny Black: a detailed description of each one of the 2880 stamps and the plates from which it was printed. London: R. Lowe, 1979.

Muir, Douglas N. Postal Reform and the Penny Black: A New Appreciation. London: National Postal Museum, 1990

Nissen, Charles. Great Britain: The Penny Black: Its Plate Characteristics. Kent, [England]: F. Hugh Vallancey, 1948.

Nissen, Charles and Bertram McGowan. The Plating of The Penny Black Postage Stamp Of Great Britain, 1840: with a description of each individual stamp on the eleven different plates, affording a guide to collectors in the reconstruction of the sheets. London: Stanley Gibbons, 1998

Proud, Edward B. Penny Black Plates. Heathfield, East Sussex: International Postal Museum, 2015.

Rigo de Righi, A.G. The Story of the Penny Black and Its Contemporaries. London: National Postal Museum, 1980