Mehnert, Klaus
Frederick A. Praeger, 1962
Buku Teks
Doubleday & company, 1964
Buku Teks
Dodds, Klaus
Prentice-Hall, 2000
Buku Teks
Taylor, A. E. (Alfred Edward), 1869-1945, author
Doubleday, 1952
Buku Teks
Ulam, Adam Bruno, author
Beacon Press, 1973
Buku Teks