Bagus Takwin
Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 2002
UI - Tesis Membership
John Baer, James C. Kaufman, Roy F. Baumeister, editor
Oxford University Press, 2008
Buku Teks SO
Lewis, Clarence Irving
Dover, 1956
Buku Teks
Banerjee, Nikunja Vihari
George Allen and Unwin, 1958
Buku Teks
Baruss, Imants
Purdue Univ.Press , 1996
Buku Teks