Siegel, James T., 1937-, author
University of California Press, 1969
Buku Teks
Daman, Jan
Contact, 1968
Buku Teks
Huber, Carlo, author
The Council for Research Values and Philosophy , 2001
Buku Teks
Lari, Sayyid Mujtaba Musavi, author
Foundation of Islamic Cultural Propagation in The World, 1993
Buku Teks
Murray, Margaret Alice, author
Oxford University Press, 1970
Buku Teks