Hilgard, Ernest R. (Ernest Ropiequet), 1904-2001, author
Harcourt Brace Jovanovich, 1979
Buku Teks
Glassman, William E., author
Open University Press, 2004
Buku Teks
Pastorino, Ellen, author
Wadsworth and Cengage Learning, 2012
Buku Teks
Ruch, Floyd L., author
Foresman, 1971
Buku Teks
Ruch, Floyd L., author
Scott, Foresman, 1958
Buku Teks