White, David Manning
Macmillan, 1983
Buku Teks
Siegel, James T., 1937-
University of California Press, 1969
Buku Teks
Daman, Jan
Contact, 1968
Buku Teks
Huber, Carlo
The Council for Research Values and Philosophy , 2001
Buku Teks
Lari, Sayyid Mujtaba Musavi
Foundation of Islamic Cultural Propagation in The World, 1993
Buku Teks