Held, Gilbert
John Wiley & Sons, 1995
Buku Referensi
Paxton, John
J.M. Dent & Sons, 1992
Buku Referensi
Schwartz, Robert J.
Crowell , 1955
Buku Referensi
Jones, David J.
Australia, Second Back Row Press
Buku Referensi
Oxford University Press, 1996
Buku Referensi