Kapfer, Mirriam B.
Educational Technology Publication, 1972
Buku Teks
Davies, Ivor K., author
McGraw-Hill, 1976
Buku Teks
Lindgran, Henry Clay
John Wiley & Sons, 1966
Buku Teks
McNeil, John D., author
Litle Brown, 1977
Buku Teks
edited by Limon E. Kattington
Nova Science, 2010
Buku Teks