Heffner, Richard D.
A Mentor Book, 1956
Buku Teks
Taylor, John
Routledge and Kegan Paul , 1814
Buku Teks
Allen, Ann Taylor, author
Oxford University Press, 2017
eBooks
Hargreaves, John D.
Prentice-Hall, 1967
Buku Teks
Endah Saftarina Khairiyani, author
Fakultas Ilmu Sosial dan Ilmu Politik Universitas Indonesia, 2022
UI - Tesis (Membership)