University of Texas Press, 1997.
Buku Teks
Mark Lusk
Springer, 2012
eBooks
Eisenstadt, Todd A., author
Camberidge University Press , 2004
Buku Teks
edited by Joseph A. Kahl
Little, Brown, 1968
Buku Teks
Borror, Donald J., author
Houghton Mifflin, 1976
Buku Referensi