edited by Dorwin Cartwright, Alvin Zander
Harper & Row , 1968
Buku Teks
Burger, Jerry M., author
Wadsworth, 1986
Buku Teks
Routledge, 2017
eBooks
Hilario, Blasco-Fontecilla, author
Nova Science Publishers, Inc, 2007
Buku Teks
Hedung, Tilde, author
Routledge, Taylor & Francis Group, 2010
Buku Teks