Roskin, Michael G., author
Pearson/Prentice Hall, 2004
Buku Teks
Adem, Seifudein, author
Routledge, Taylor & Francis Group, 2018
Buku Teks
Nayar, Baldev Raj, author
Cambridge, 2003
Buku Teks
Bartlett, Ruhl
Hill and Wang, 1963
Buku Teks
edited by Burns H. Weston
Transnational , 1994
Buku Teks