Dhita Hapsarani, author
1995
UI - Tesis (Membership)
Clarke, Marcus, author
Hale & Iremonger, c1983
Buku Teks
Her Majesty's Stationery Office, 1973
Buku Referensi
National conference on social welfare
Columbia University Press, 1974
Buku Teks
Cohen, Edi, author
Rockport Publishers, 2000
Buku Referensi