Corey, Gerald
IKIP Semarang Press , 1995
Buku Teks
Stewart, William
How to Books, 1999
Buku Teks
Brown, Jeannette A
Brooks.Cole, 1983
Buku Teks
Stone, Gerald L
Brooks/Cole, 1985
Buku Teks
editor, Don C. Locke, Jane E. Myers, Edwin L. Herr
Sage, 2001
Buku Referensi