Barron, David
Addison-Wesley Publishing , 1987
Buku Teks
Brown, Adrian, author
Facet Publishing, 2006
Buku Teks
Sharples, Mike, 1952-, author
Ellis Horwood Limited, 1985
Buku Teks
Frank, Marcella, author
Prentice-Hall, 1972
Buku Teks
Terribile, Mark A., author
Prentice-Hall, 1993
Buku Teks