Warner, W. Lloyd, author
Harper & Brothers , 1944
Buku Teks
Moule, jean, author
Wadsworth and Cengage Learning, 2012
Buku Teks
Durden, William G.
Hogrefe & Huber Publishers, 1994
Buku Teks
Simons, Ronald L., author
Macmillan, 1985
Buku Teks
Murphy, Gardner, author
Basic Books, Inc., 1953
Buku Teks