Colquhoun, D.
Clarendom Press, 1971
Buku Teks
Brown, Byron Wm, author
John Wiley & Sons, 1977
Buku Teks
Lancaster, H.O., author
John Wiley & Sons, 1974
Buku Teks
Schork, M. Anthony, author
Prentice-Hall, 2000
Buku Teks
Murphy, Edmond A., author
John Hopkins University Press, 1982
Buku Teks