Ritter, Scott
IB Tauris, 2005
Buku Teks
Jones, Robert P. (Robert Patrick)
Simon & Schuster Paperbacks, 2017
Buku Teks SO
Schwartz, Bernard
McGraw-Hill, 1974
Buku Teks SO
Rippy, J. Fred
University of Michigan Press, 1958
Buku Teks SO
Risjord, Norman K.
Prentice-Hall, 1985
Buku Teks SO