Herve Abdi, author
Oxford University Press, 2009
Buku Teks
Christensen, Larry B., 1941-, author
Allyn and Bacon, 1988
Buku Teks
Christensen, Larry B., 1941-, author
Pearson/Allyn & Bacon, 2007
Buku Teks
Mitchell, Mark L., author
Wadsworth and Cengage Learning, 2013
Buku Teks
Mitchell, Mark L., author
Thomson Wadsworth, 2007
Buku Teks