Clark, Mary Jo, author
Appleton & lange , 1999
Buku Teks
Fell-Carlson, Deborah L., author
Thomson/Delmar Learning, 2008
Buku Teks
editors, John M. Last, Robert B. Wallace ; associate editors, Elizabeth Barrett-Connor [and others]
Appleton & Lange, 1992
Buku Referensi
edited by Philip E. Sartwell
Meredith Publ., 1965
Buku Teks
Stoppard, Miriam
Darling Kindesley , 1991
Buku Teks