Ario Sasongko, author
Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 2015
UI - Tesis (Membership)
Brink, Raymond
D. Appleton-Century Co., 1940
Buku Teks
Barron, Randall F.
McGraw-Hill, 1966
Buku Teks
Randall, Geoffrey
Routledge, 1993
Buku Teks
Spiller, Neil, author
Academy Group, 2001
Buku Teks