Deutsch, Kenneth, author
Wadsworth and Cengage Learning, 2009
Buku Teks
Levy, Leonard W., author
Harper, 1963
Buku Teks
Franklin, John Hope, author
Alfred A.Knopf, 1961
Buku Teks
Morrison, John, author
Penguin Books, 1985
Buku Teks
Woytinsky,W.S
The Vanguard Press,Inc, 1961
Buku Teks