Skolnick, Jerome H., author
Delmar, 1977
Buku Teks
Rawlings, Philip, author
Longman, 1999
Buku Teks
Wilson, Paul, author
Scribe, 1990
Buku Teks
Abadinsky, Howard, author
Nelson-Hall, 1990
Buku Teks
Wilson, P. R., author
University of Queensland, 1973
Buku Teks