Hofstede, Geert, author
McGraw-Hill, 2005
Buku Teks
Kachru, Yamuna, author
Routledge, 2008
Buku Teks
Fogg, G. E. (Gordon Elliott), 1919-, author
The University ofWisconsin press, 1987
Buku Teks
Bessette, Jean Michel
L`Harmatten, 1999
Buku Teks
Ehrmann, Henry W., author
Prentice-Hall, 1976
Buku Teks