Muhammad Irvan, author
Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 2004
UI - Skripsi (Membership)
edited by Edmund S. Morgan
Prentice-Hall, 1965
Buku Teks
Morris, Richard B., author
Van Nostrand Reinhold, 1955
Buku Teks
Unrau, Harlan D.
National Park Service, 1976
Buku Teks
Miller, John C.
Stanford University Press, 1965
Buku Teks