Doessel, D. P.
Avebury, 1992
Buku Teks
Hicks, Lanis L., author
Jones & Bartlett Learning, 2014
Buku Teks
Wonderling, David, author
Open University Press, 2005
Buku Teks
Cooper, Michael H., author
John Wiley & Sons, 1975
Buku Teks
Folland, Sherman, author
Prentice-Hall, 2001
Buku Teks