Mazur, James E., author
Prentice-Hall, 1994
Buku Teks
Brenda Rapp
Psychology Press, 2001
Buku Teks
French, Wendell L., author
Harper & Row, 1985.
Buku Teks
Bloom, Floyd E.
W.H. Freeman & Co. , 1988
Buku Teks
Medin, Douglas L., author
Harcourt College Publisher, 2001
Buku Teks