Winterowd, W. Ross
Harcourt Brace Jovanovich, 1981
Buku Teks
Bailey, Edward P., author
Charles E. Merrill, 1984
Buku Teks
Caruso, Domenick, author
W.W. Norton, 1977
Buku Teks
Holladay, Sylvia A., author
Prentice-Hall, 1981
Buku Teks
Goddard, Ken, author
The Bath Press, 1995
Buku Teks