edited by Peggy Simcic Brønn, Stefania Romenti, Ansgar Zerfass
Emerald, 2016
eBooks
Beck, Charles E., author
Prentice-Hall, 1999
Buku Teks
Ewald, Helen Rothschild, author
Prentice-Hall International, 1997
Buku Teks
Locker, Kitty O., author
McGraw-Hill, 2013
Buku Teks
Locker, Kitty O., author
Irwin, 1995
Buku Referensi