Davies, Ivor K., author
McGraw-Hill, 1976
Buku Teks
Kapfer, Mirriam B.
Educational Technology Publication, 1972
Buku Teks
McNeil, John D., author
Litle Brown, 1977
Buku Teks
edited by Limon E. Kattington
Nova Science, 2010
Buku Teks
Taylor, Philip H., author
NFER Publishing, 1979
Buku Teks