Keesing, Roger M.
New perspectives in cultural anthropology /Roger M. Keesing, Felix M. Keesing
Holt, Rinchart and Winston, 1971
 Buku Teks SO
Oskamp, Stuart
Attitudes and opinions
Lawrence Erlbaum , 2005
 Buku Teks SO
Savira Rahmayani Faturahman
Fethullah Gülen sebagai tokoh sentral dalam gerakan Fethullah Gülen
Fakultas Ilmu Pengetahuan Budaya Universitas Indonesia, 2011
 UI - Skripsi Open
Levin, Henry M.
Cost effectiveness: a primer. New perspectives in evaluation / Henry M. Levin
SAGE publications, 1983
 Buku Teks SO
Kehm, Barbara M
Higher education in Germeny : Developments, problems, and perspectives / By Barbara M. Kehm
Wittenberg and Bucharest, 1999
 Buku Teks