Hildebrand, David K., 1940-, author
Duxbury Press, 1996
Buku Teks
Hildebrand, David K., 1940-, author
Duxbury Press, 1991
Buku Teks
Stuart, Alan, author
Charles Griffin, 1976
Buku Teks
Bartz, Albert E
Macmillan, 1981
Buku Teks
Frost, S.E., author
Doubleday, 1962
Buku Teks