Hamburger, Max
New Haven Yale University Press, 1951
Buku Teks
Bergman, Peter Gabriel
Prentice Hall of India, 1987
Buku Teks
Bergmann, Peter Gabriel
Dover, 1976
Buku Teks
Daly, L. J.
Loyola University Press, 1962
Buku Teks
Hirth, John Price
John Wiley & Sons, 1982
Buku Teks