Hill, Ernestine
Angus and Robertson, 1961
Koleksi Publik
Morrison, Tony
Vintage Books, 2003
Buku Teks SO
Dobson, W. A. C. H.
University of Toronto Press, 1959
Buku Teks SO
Winfeld, Liz
[American Management Association;, ], 2001
eBooks
International Development Research Centre and Institute of Southeast Asian Studies, 1997
Buku Teks