edited by Stuart E. Rosenberg
University of Toronto Press, 1962
Buku Teks
Maidment, Frederick, author
Prentice-Hall, 1999
Buku Teks
Maidment, Frederick, author
Prentice-Hall, 2000
Buku Teks
Kaufmann, Walter, editor
Reader's Digest Press, 1977
Buku Teks
Carroll, Archie B., author
Thomson , 2003
Buku Teks