Lamur, H.E.
Nijhoff, 1973
Buku Teks SO
Pasapardi Suparlan
Fakultas Ilmu Pengetahuan Budaya Universitas Indonesia, 1976
UI - Tesis Membership
Van Boeckel, Joseph J.G.M.
Helder, [Date of publication not identified]
Buku Teks SO
Sheth, Jagdish N.
John Wiley & Sons, 1988
Buku Teks SO
edited by Robert H. Kargon
American Association for the Advancement of Science, 1974
Buku Teks SO