Cambridge University Press, 2017
eBooks
Argenti, John, author
Allen & Unwin, 1975
Buku Teks
Richard, Lyn, Author
Sage, 2014
Buku Teks
Hart, Andrew, author
Routledge, 1997
Buku Referensi
edited by Catherine Cassel and Gillian Symon
Sage, 1995
Buku Teks