Cooper, Davina, author
Cambridge University Press, 2004
Buku Teks
Bowen, John R., author
Cambridge Uiversity Press, 2003
Buku Teks
Pandey, Umesh Chandra, author
Emerald Publishing Limited, 2020
eBooks
edited by Avigail Eisenberg and Jeff Spenner-Halev
Camberidge University Press , 2005
Buku Teks
Hutabarat, Ramly, author
Ghalia Indonesia, 1985
Buku Teks