Maclennan & Petty, 2000
Buku Teks
Martin, Judith N., author
McGraw-Hill, 2013
Buku Teks
Barnet, Sylvan, author
Longman, 2001
Buku Teks
edited by Lai Ah Eng, Francis L. Collins and Brenda S.A. Yeoh
Institute of South East Asia Studies, 2013
eBooks
Manning, Peter J., author
Oxford University Press, 1990
Buku Teks