Toni, Bourama, editor
Springer, 2012
eBooks
Mendenhall, William, author
Duxbury Press, 1981
Buku Teks
Devore, Jay L, author
[Springer, ], 2012
eBooks
Devore, Jay L. , author
Brooks/Cole, Cengage Learning , 2012
Buku Teks
Schork, M. Anthony, author
Prentice-Hall, 2000
Buku Teks