Encyclopedia of marriage and the family : volume 2
David Levinson, editor in chief
Simon & Schuster Macmillan, 1995
 Buku Referensi
Encyclopedia of social psychology : 1
Roy F. Baumeister, Kathleen D. Vohs, editors
Sage Publications, 2007
 Buku Referensi
Encyclopedia of linguistics : volume 1
Philipp Strazny, editor
Fitzroy Dearborn, 2005
 Buku Referensi
The Encyclopedia of religion: volume 1
editor, Mircea Eliade
Macmillan Publishing Company, 1987
 Buku Referensi
Encyclopedia of the future : volume 1
edited by George Thomas Kurian, Graham T.T. Molitor
Macmillan Library Reference USA, 1996
 Buku Referensi