Schein, Edgar H., author
San Francisco, 1992
Buku Teks
Giles, Judy, author
Blacwell Publisher, 2008
Buku Teks
edited by R.I. Freshney
IRL Press, 1992
Buku Teks
editor, Wiendu Nuryanti
Gadjah Mada University Press , 1996
Buku Referensi
Matsumoto, David, author
Thomson Wadsworth, 2004
Buku Teks