Toynbee, Arnold J., author
Oxford University Press, 1956
Buku Teks
Mary Kupiec Cayton, Elliott J. Gorn, Peter W. Williams, editors
Charles Scribner's Sons, 1993
Buku Referensi
Clark, Victor S., author
Peter Smith, 1949
Buku Teks
Murdoch, James, author
Routledge , 1926
Buku Referensi
Toynbee, Arnold J., author
Oxford University Press, 1956
Buku Teks