Kaplan, Robert M., author
Allyn and Bacon , 1987
Buku Teks
Adkins, Dorothy C., author
Charles E. Merrill Books , 1964
Buku Teks
Kuzma, Jan W., author
Mayfield Publ., 1984
Buku Teks
Siegel, Sidney, author
Armico, 1985
Buku Teks
Hinkle, Dennis E., author
Houghton Mifflin, 2003
Buku Teks