Hughes, Fredrick W., author
Prentice-Hall, 1983
Buku Referensi
Rukl, Antonin, author
Sterling Publishing Co., 1999
Buku Referensi
Wilson, A. Paula, author
Neal-Schuman Publishers, 2005
Buku Teks
Markus, John, 1911-, author
McGraw-Hill, 1974
Buku Referensi
Boyle, Cailin, author
Rockport Publishers, 2001
Buku Teks