May, Tim, author
Open University Press, 2001
Buku Teks
Bion, W.R.
Basic Book, Inc. , 1961
Buku Teks
Shipman, Marten
Longman, 1988
Buku Teks
Vaus, D.A.de
University College London Press, 1996
Buku Teks
Miller, Delbert C., author
Longman, 1983
Buku Teks