Stearns, Peter N., author
Macmillan, 1967
Buku Teks
Taylor, Jean Gelman, 1944-, author
University of Wisconsin Press, 1983
Buku Teks
edited by Vincenzo Ruggiero, Nigel South, Ian R. Taylor
Routledge , 1998.
Buku Teks
Lopez, Alan D., author
WHO, 1984
Buku Teks
Roy F. Baumeister, Kathleen D. Vohs, editors
Sage Publications, 2007
Buku Referensi