Thomas, Lynn Louis
Xerox University Microfilm, 1977
Buku Teks
Singarimbun, Masri, author
University of California Press, 1975
Buku Teks
Djamour, Judith
Humanities Press, 1965
Buku Teks
Graburn, Nelson
Harper & Row, Publishers, 1971
Buku Teks
Eduardo Edwin Ramda, author
Bestuurskunde, 2021
Artikel Jurnal