Johnson, David W., 1940-
Prentice Hall Internasional, 1990
Buku Teks SO
Adams, Georgia Sachs
Holt, Rinehart and Winston, 1965
Buku Teks
Schunk, Dale H.
Prentice-Hall, 1996
Buku Teks SO
Kim, Yong Su, 1952-
Ifield, 2005
Buku Referensi
Santrock, John W.
McGraw-Hill, 2008
Buku Teks