Harvest House, 1968
Buku Teks
Royston, Michael G., author
Pergamon Press, 1979
Buku Teks
Harrison, Roy M., author
Whitstable Litho, 1982
Buku Teks
Untung, author
Universitas Indonesia, 2013
UI - Tesis (Membership)
Davenport, S.J.
Washington, DC: United States Department of the Interior, 1954
Buku Teks