Ewald, Helen Rothschild
Charles E. Merrill Publishing Company, 1983
Buku Teks
McCrimmon, James W., author
Houghton Mifflin, 1984
Buku Teks
Lerner, Marcia, author
Random House, 2001
Buku Teks
Booth, Wayne C., author
Harper & Row, 1987
Buku Teks
Bailey, Edward P., author
Charles E. Merrill, 1984
Buku Teks