Bluth, Christoph
Dartmouth , 1995
Buku Teks
Casamassa, Jack V.
McGraw-Hill, 1965
Buku Teks
Siu, Ralph Gun Hoy
John Wiley & Sons, 1980
Buku Teks
Skinner, G. William, author
Cornell University Press, 1958
Buku Teks
Garry, Ralph
Prentice-Hall, 1969
Buku Teks