Stott, Philip
Allen & Unwin, 1981
Buku Referensi
Jones, Rodwell Ll.
Methuen, 1950
Buku Teks
Courville, Serge
UBC Press, 2000
Buku Teks
edited by George W. Hoffman ; contributors, Christopher Shane Davies ... [and others]
Wiley, 1983
Buku Teks
Wheatley, Paul
University Of Malaya Press, 1961
Buku Teks