edited by Ian S. Markham, Tinu Ruparell
Blackwell, 2001
Buku Teks SO
DeSpelder, Lynne Ann
McGraw-Hill, 2011
Buku Teks SO
Artikel Jurnal
edited by Yew-Foong Hui
Institute of South East Asia Studies, 2013
eBooks
Adler, Mortimer Jerome, 1902-2001
Holt, Rinehart and Winston, 1967
Buku Teks SO