Ellul, Jacques
Vintage Books, 1954
Buku Teks
Moantford, Charles P.
Angus and Robertson, 1965
Buku Teks
Zimmer, Heinrich
Pantheon Books, 1955
Buku Teks
Hotchkiss, George Burton, author
Macmillan, 1950
Buku Teks
Rudolph, Richard C
University of California Press, 1951
Buku Teks