Mason, Alpheus Thomas,1899-1989, author
Prentice-Hall, 1993
Buku Teks
Dodd, Walter Fairleigh, 1880-1960, author
West Publishing, 1949
Buku Teks
Kauper, Paul G., author
Little, Brown, 1971
Buku Teks
Keir, D. L. (David Lindsay), author
Oxford University Press, 1948
Buku Teks
Keir, D. L. (David Lindsay), author
Clarendon Press, 1967
Buku Teks