Turner, Jeffrey S.
Holt, Rinehart and Winston, 1987
Buku Teks SO
Turner, Jeffrey S.
Harcourt Brace College, 1995
Buku Teks SO
Dacey, Austin, 1972-
Brown & Benchmark, 1994
Buku Teks SO
Berk, Laura E.
Allyn and bocon , 2001
Buku Teks SO
Dacey, John S.
McGraw-Hill, 2002
Buku Teks SO