Berdie, Douglas, author
The Scarecrow Press, 1974
Buku Teks
Sheed and Ward , 1966
Buku Teks
Lazou, Christopher
Clarendon Press , 1988
Buku Teks
Aumiaux, M., author
John Wiley & Sons, 1980
Buku Teks
Davis, Kenneth P., author
McGraw-Hill, 1976
Buku Teks