Menchik, Jeremy, author
Cambridge University Press, 2016
eBooks
Hardin, Russell
Oxford University Press, 1999
Buku Teks
Fenwick, Stewart, author
New York, NY : Routledge, 2017
Buku Teks
Artikel Jurnal
Robinson, Kathryn, author
Routledge, 2009
Buku Teks