Ritter, Dale F., author
W.C. Brown, 1986
Buku Teks
Anderson, Robert S. (Robert Stewart), 1952-
Cambridge University Press, 2010
Buku Teks
Easterbrook, Don J.
McGraw-Hill, 1969
Buku Teks
Artikel Jurnal
Burbank, Douglas West, author
Wiley-Blackwell, 2012
Buku Teks