Hill, Ernestine
Angus and Robertson, 1961
Koleksi Publik
Morrison, Tony
Vintage Books, 2003
Buku Teks SO
Winfeld, Liz
[American Management Association;, ], 2001
eBooks
edited by Wendy Dobson and Chia Siow Yue
International Development Research Centre and Institute of Southeast Asian Studies, 1997
Buku Teks
Betsky, Aaron
Gingko Press, 2000
Buku Teks SO