Cohen, Paul A., author
Routledge, 2003
Buku Teks
Cynthia B. Leung
Springer, 2012
eBooks
Cook, Alicia Skinner, author
Macmillan, 1983
Buku Teks
Dreeni Geer, M. Abdus Sabur
Asian Resource Foundation, 2001
Buku Teks
Tugnoli, Matteo, author
Springer Cham, 2019
eBooks