Thompson, Leon Whitey
Winter Book, 1995
Buku Teks
Artikel Jurnal
Bowett, D.W. (Derek William)
Manchester University Press, 1967
Buku Teks
Churchill, R.R.
Manchester University Press, 1992
Buku Teks
edited by Alan E. Ingham
John Wiley & Sons, 1975
Buku Teks