Afsghar, Haleh
Longman, 1991
Buku Teks
edited by J.G.M. Hilhorst
The Hague, 1967
Buku Teks SO
Dixon, Chris J.
Routledge, 2015
Buku Teks SO
edited by Chandra Talpade Mohanty, Ann Russo, Lourdes Torres
Indiana University Press, 1991
Buku Teks
Todaro, Michael P.
Longman, 1992
Buku Teks