Stiling, Peter D.
Prentice Hall Inc., 1999
Buku Teks
Kumar, H.D.
House PVT LTD, 1992
Buku Teks
Buchsbaum, Ralph
The Boxwood Press, 1970
Buku Teks
Bush, Mark B
Prentice-Hall, 2000
Buku Teks
McIntosh, Robert P.
Cambridge University Press, 1988
Buku Teks