Peter Dabrock
Springer, 2012
eBooks
Brooks, Elizabert C
Jones & Bartlett Learning, 2013
Buku Teks
Tucker, Edwin W.
Irwin, 1992
Buku Teks
Guido, Ginny Wacker
Prentice-Hall, 2006
Buku Teks
edited by Richard Hugman, David Smith
Routledge, 1996
Buku Teks