UNICEF
Unicef, 2002
Buku Teks SO
Selby, David
Cambridge University Press, 1988
Buku Teks
edited by Dianne Otto
Edward Elgar, 2013
Buku Referensi
Persatuan Kesedaran Komuniti Selangor (EMPOWER), 2012
Buku Teks SO
edited by Julie Peters and Andrea Wolper
Rouledge, 1995
Buku Teks SO