Chrisman, Nicholas, author
John Wiley & Sons, 1997
Buku Teks
edited by Judy L. Van Raalte, Britton W. Brewer
American Psychological Association, 2002
Buku Teks
Ballard, Robert D., author
National Geographic Society, 1983
Buku Referensi
by John E. Brewton ... [et al.]
Laidlaw Brother, 1957
Buku Teks
Valin, Robert D. van, author
Cambridge University Press, 2005
Buku Teks