Willy Aulia
Sekolah Kajian Stratejik dan Global Universitas Indonesia, 2019
UI - Tesis (Membership)
Perry, Walter
The Open University Press, 1976
Buku Teks
Pearson Education, Prentice Hall, 2007
Multimedia
Neville, Adam M.
Pitman, 1981
Buku Teks
Neville, Adam M.
Longman Scientific and Technical, 1987
Buku Teks