Gorrell, Paul. author
Cambridge University Press, 2006
Buku Teks
Pittman, Thomas, author
Prentice-Hall, 1992
Buku Teks
Cambridge University Press, 1995
eBooks
Tremblay, Jean-Paul, 1938-, author
McGraw-Hill, 1985
Buku Teks
Terry, Patrick D., author
Addison-Wesley, 1986
Buku Teks