Lele, Uma
Johns Hopkins, 1975
Buku Teks SO
edited by Kjell A. Eliassen and Jan Kooiman
Sage, 1993
Buku Teks
edited by Michael M. Horowitz and Thomas M. Painter
Westview Press, 1986
Buku Teks SO
Artikel Jurnal
Macneil, Ian R.
[Publisher not identified], 1966
Buku Teks