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