edited by: John Halligan and Chris Paris
Longman Chesire, 1984
Buku Teks SO
edited by William J. Murin
Moore Publishing, 1982
Buku Teks SO
Barlow, I.M.
Research Studies Press, 1981
Buku Teks SO
Miftah Fadhli
Fakultas Ilmu Sosial dan Ilmu Politik Universitas Indonesia, 2015
UI - Skripsi Membership
Saltzstein, Alan L.
Wadsworth/Thomson learning, 2003
Buku Teks SO