Hoevemeyer, Victoria A., author
American Management Association, 2006
eBooks
Magnusson, Eva, author
Cambridge University Press, 2015
Buku Teks
edited by Bill Katz; Ruth A. Fraley
Haworth Press, 1987
Buku Teks
Longman, 1995
Buku Teks
Longman, 1996
Buku Teks