Neumayer, Eric, author
Cambridge University Press, 2017
eBooks
Wiyogo P. Wicaksono, author
Universitas Indonesia, 2014
Artikel Jurnal
Neuman, Lawrence W., author
Pearson New International edition, 2014
Buku Teks
Neuman, William Lawrence, 1950-, author
Allyn and Bacon, 2003
Buku Teks
Palys, T.S. (Theodore Stephen), author
Nelson Education, 2014
Buku Teks