Thiroux, Jacques P. author
MacMillan Publishing Company, 1985
Buku Teks
Thiroux, Jacques P. author
Prentice-Hall, 1995
Buku Teks
Hick, John H., 1922-2012, author
Prentice-Hall, 1990
Buku Teks
Bowen, John R., author
Pearson, 2005
Buku Teks
Pojman, Louis P.
English : 6th ed., International ed., 2012
Buku Teks