edited by Kenneth R. Hammond
Holt, Rinehart and Winston, 1966
Buku Teks
Lefton, Lester A.
Allyn and bacon , 1997
Buku Teks
Wortman, Camille B.
McGraw-Hill, 1992
Buku Teks
Myers, David G.
Worth, 1986
Buku Teks
Santrock, John W.
Worth Publishers, 1998
Buku Teks