Makkai, Adam
Barrons, 1995
Buku Teks
Cummings, Paul, author
St. Martin's Press, 1966
Buku Referensi
Evans, Bergen, 1904-, author
Random House, 1957
Buku Referensi
Chapman, Robert L., author
London Pan Books 1988
Buku Referensi
edited by Jess Stein
Dell Publishing, 1962
Buku Referensi