Enthoven, R.E.
The Clarendon Press, 1924
Buku Teks
Maman Suherman, author
Pop, 2016
Buku Teks
Garland Publishing, 1996
Buku Teks
Peking : The Catholic University Press
Majalah, Jurnal, Buletin
Arnold, Thurman Wesley, author
Blue Ribbon Books, 1937
Buku Klasik