Popkin, Gary S., author
Mifflin Company, 1981
Buku Teks
Burian, Barbara J., author
Prentice-Hall, 1982
Buku Teks
Dover Publications , 1971
Buku Teks
Orilia, Lawrence, author
John Wiley & Sons, 1972
Buku Teks
Fried, Louis, author
Reston Publishing, 1979
Buku Teks