Ohaegbulam, Festus Ogboaja
University Press of America, 1980
Buku Teks
Sachs, Albie
University of California Press, 1973
Buku Teks
Robertson, Hector Menteith, author
Cambridge University Press, 1957
Buku Teks
Lusi Puspitaningrum, author
Fakultas Ilmu Sosial dan Ilmu Politik Universitas Indonesia, 2021
UI - Tesis (Membership)
Routledge, 1995
Buku Teks