Reid, Graham L.
Penguin, 1970
Buku Teks
Saxena, Surrendra Kumar, author
Martinus Nijhoff , 1955
Buku Teks
Allen, G.C., author
Longman, Green, 1952
Buku Teks
Graham-Green, Graham J.
Butterworth, 1973
Buku Teks
Elcock, Howard, author
Routledge, 1994
Buku Teks