Taylor, Griffith, author
Methuen, 1949
Buku Teks
Portney, Leslie Gross, author
Prentice-Hall, 2000
Buku Teks
John W. Berry...[et al.].
Cambridge University Press, 2002
Buku Teks
Forsterling, Friedrich, author
Psychology Press, 2001
Buku Teks
Schunk, Dale H., author
Pearson Education, 2010
Buku Teks