Knop, Larry E., author
CRC Press, 2009
Buku Teks
Ravishanker, Nalini, author
Chapman & Hall , 2002
Buku Teks
Ross, Sheldon
Macmillan, 1984
Buku Teks
Oberai, M.M.
Prentice-Hall, 1974
Buku Teks
Zill, Dennis G., author
Jones & Bartlett Learning, 2009
Buku Teks