Nigel J. D. Lucas, Jayaprakasan Ambali, Enggene Chang, Marinette S. Forbes-Ricarte, Ram Manohar Shrestha
McGraw-Hill, 1987
Buku Referensi
Mouly, J.
George Allen and Unwin, 1974
Buku Teks SO
Hy, Ronald John
Greenwood Press, 1995
Buku Teks SO
editors, Hans G. Schuetze, German Alvarez Mendiola
Sense, 2012
eBooks
Banerjee, Reshmi
2010
UI - Disertasi Membership