Costa, Horacio de la, author
Carmelo and Bauermann, 1965
Buku Teks
Amstrong, John A.
Colombia University Press, 1963
Buku Teks
Pergamon Press, 1978
Buku Teks
Research Center for Peace and Unification, 1979
Buku Teks
Backing, Richard C
James Lewis ,
Buku Teks