UPP (University of Pennsylrama Press) , 1991
Buku Teks
edited by Atta-ur-Rahman
Elsevier, 1990
Buku Teks
Connell, R.W.
Longman Chesire, 1980
Buku Teks
Mackenzie, Gavin.
Cambridge University Pres, 1973
Buku Teks
Lukacs, Georg, author
Ar-Ruzz Media, 2012
Buku Teks