edited by Frank E. Bair
Gale Research Inc., 1991
Buku Referensi
James, Preston E., author
John Wiley & Sons, 1980
Buku Teks
Kolevzon, Edward R., author
Allyn and Bacon, 1959
Buku Teks
Israel, Saul, author
Holt, Rinehart and Winston, 1976
Buku Teks
James, Preston E., author
Macmillan, 1972
Buku Teks