Brown, Dale, author
Time Life, 1974
Buku Teks SO
Brown, Dale, author
Time-Life Books, 1972
Buku Teks SO
edited William P. Lineberry
H.W. Wilson, 1963
Buku Teks SO
Krakauer, Jon
Tian Xia Wen Hua Chu Ban Gongsi, 1998
Buku Teks
Pasaribu, Rhesa Leosandy, author
Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 2012
UI - Skripsi Open