Olson, David H.
McGraw-Hill , 2006
Buku Teks
edited by Harriette Pipes McAdoo
Sage, 1988
Buku Teks SO
Menjívar, Cecilia author
John Wiley & Sons, 2016
Buku Teks SO
Einstein, Mara
Lawrence Erlbaum, 2004
Buku Teks
Engler, Richard E.
Harper & Row, 1964
Buku Teks SO