Coba jelasin Daftar pustaka dari PURPLE dong

Freeman, Wes., Geoff Sullivan, and Frode Weierud, "Purple Revealed: Simulation and Computer-Aided Cryptanalysis of Angooki Taipu B", Cryptologia 27(1), January 2003. pp 1–43.

Ronald W. Clark, "The Man Who Broke Purple: the Life of Colonel William F. Friedman, Who Deciphered the Japanese Code in World War II", September 1977, Little Brown & Co, ISBN 0-316-14595-5.

Frank Rowlett, "The Story of Magic, Memoirs of an American Cryptologic Pioneer", 1998, Aegean Park Press, ISBN 0-89412-273-8. First-hand account of the breaking of Purple.