Cupitt, Don
Sheldon Press, 1979
Buku Teks
edited by M. F. Ashley Montagu
Oxford University Press, 1962
Buku Teks
Niebuhr, Reinhold, author
Nisbet & Co., 1946
Buku Teks
Carrel, Alexis, author
Penguin Books, 1967
Buku Teks
Nesturkh, M. F. (Mikhail Fedorovich), author
Progress Publishers, 1967
Buku Teks