Fell-Carlson, Deborah L., author
Thomson/Delmar Learning, 2008
Buku Teks
edited by Richard A. Smith
University of Hawaii Press, 1978
Buku Teks
Liebler, Joan Gratto, author
Jones & Bartlett Learning, 2012
Buku Teks
Akhtar, Shahid
International Development Research Centre, 1975
Buku Teks
Jensen, J. Trygve, author
John Wiley & Sons, 1982
Buku Teks