Mooney, Gavin H., author
MacMillan Press , 1980
Buku Teks
Sax, Sidney
Allen & Unwin , 1990
Buku Teks
Hicks, Lanis L., author
Jones & Bartlett Learning, 2014
Buku Teks
Folland, Sherman, author
Prentice-Hall, 2001
Buku Teks
Ruchlin, Hirsch S., author
Charles C. Thomas, 1973
Buku Teks