Jick, Todd D., author
McGraw-Hill, 2011
Buku Teks
Moore, Wilbert E. (Wilbert Ellis), author
Prentice-Hall, 1967
Buku Teks
Cooper, Robert L., author
Cambridge University Press, 1989
Buku Teks
Srinivas, M.N., author
University of California Press, 1973
Buku Teks
McRobert, Kenneth
McClelland and stewart, 1976
Buku Teks