Phares, Vicky, author
John Wiley & Sons, 2008
Buku Teks
Boere, C. George, author
Primasophie, 2008
Buku Teks
DuBrin, Andrew J., author
Pergamon Press, 1972
Buku Teks
Solso, Robert L., 1933-, author
Allyn and Bacon, 1998
Buku Teks
Hurlock, Elizabeth Bergner, 1898-, author
Erlangga, 1996
Buku Teks