Devine, Fiona, author
Cambridge University Press, 2004
Buku Teks
Ricklefs, M.C. (Merle Calvin), 1943-, author
Oxford University Press, 1977
Buku Referensi
O`Leary, John, author
QS Quacquarelli Symonds Limited, 2010
Buku Referensi
Feingold, Mordechai, author
Oxford University Press, 2017
eBooks
Mordechai Feingold, editor
Oxford University Press, 2016
eBooks