Koestler, Arthur, author
Victor Gollancz, 1937
Buku Teks
Steenbeek, Rosita, author
Uitgeverij De Arbeiderspers, 2006
Buku Teks
Fucilla, Joseph G., author
Follett Publishing Company, 1964
Buku Referensi
Collier, Leonard Dawson, author
St. Paul's House Warwick Lane, 1973
Buku Teks
Payne, Stanley G., author
W.W. Norton, 1970
Buku Teks