Majul, Cesar A., author
The University of The Philippines Press, 1973
Buku Teks
Majul, Cesar A., author
University of the Philippines Press, 1999
Buku Teks
Cithayu Dyah Utami, author
2018
UI - Skripsi (Membership)
Forbes, Cameron W.
Houghton Miffiln, 1928
Buku Klasik
Cambridge University Press, 2019
eBooks