Boyd, Denise
Pearson, 2005
Buku Teks
Turner, Jeffrey S.
Holt, Rinehart and Winston, 1987
Buku Teks
Turner, Jeffrey S.
Harcourt Brace College, 1995
Buku Teks
Dacey, John S.
McGraw-Hill, 2002
Buku Teks
Dacey, Austin, 1972-
Brown & Benchmark Publishers , 1994
Buku Teks