Conor O'Reilly, editor
Routledge, 2017
Buku Teks
Andrew Millie, Dilip K. Das, editor
CRC Press, Taylor & Francis Group, 2008
Buku Teks
Jones-Brown, Delores D., author
Pearson/Prentice Hall, 2004
Buku Teks
Smart, Huw, author
Oxford University Press, 2006
Buku Referensi
Brewer, Russell
Oxford University Press, 2014
Buku Teks