Thomson, David
Penguin Books, 1951
Buku Teks
edited by Maurizio Isabella and Konstantina Zanou
Bloomsbury Academic, An imprint of Bloomsbury Publishing Plc, 2016
Buku Teks
Golde, Hilary, author
NSWU Press, 1985
Buku Teks
Febrian Kartono, author
Universitas Indonesia, 2015
UI - Tesis (Membership)
Whittemore, Claire
Oxfam Public Affairs Unit, 1981
Buku Teks