Whittemore, Claire
Oxfam Public Affairs Unit, 1981
Buku Teks
University of Hawaii, 1974
Buku Teks
Butterworth-Heinemann, 2015
eBooks
Widjojo Nitisastro, author
Jakarta Institute for Economic and social Research, Faculty of Economics, University of Indonesia 196.,
Buku Teks
Parson, Keneth H.
The University of Wisconsin Press, 1956
Buku Teks