Hawkins, David E., author
Palgrave-Macmillan, 2006
Buku Teks
Busyra Azheri, author
RajaGrafindo Persada, 2012
Buku Teks
Reza Rahman, author
Buku Kita, 2009
Buku Teks
Ralph Tench, William Sun, Brian Jones, editors
Emerald, 2014
Buku Teks
Coombs, W. Timothy, author
Wiley-Blackwell , 2012
Buku Teks