White, John, author
The Overseas Development Institute, 1967
Buku Teks
Black, Lloyd D.
D. Van Nostrand Company, Inc., 1968
Buku Teks
Little, Ian M.D.
George Allen and Unwin, 1965
Buku Teks
Arnold, H.J.P., author
Dufour Editions, 1966
Buku Teks
McNeill, Desmond
Croom Helm, 1981
Buku Teks