Steiner, Rudolf, author
Rudolf Steiner, 1963
Buku Teks
John Baer, James C. Kaufman, Roy F. Baumeister, editor
Oxford University Press, 2008
Buku Teks
Bagus Takwin, author
Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 2002
UI - Tesis Membership
Lewis, Clarence Irving, author
Dover, 1956
Buku Teks
Banerjee, Nikunja Vihari, author
George Allen and Unwin, 1958
Buku Teks