Enos, Matthew, author
Wadsworth, 2002
Buku Teks
Kalat, James W., author
Wadsorth , 2001
Buku Teks
Fernald, L. Dodge
Houghton Miffiln, 1978
Buku Teks
Rita L. Atkinson ... [et al.]
Harcourt Brace College, 1993
Buku Teks
by Clifford T. Morgan [and others]
McGraw-Hill, 1986
Buku Teks