Eddleston, Michael
New York Oxford Univ. Press 2002,
Buku Referensi
Eddelson, Michael, author
Oxford University Press, 1999
Buku Referensi
Nick Beeching, Geoff Gill.
Wiley-Blackwell, 2014
Buku Teks
InternaPublishing, 2014
Prosiding - Seminar
Hunter, George E., author
W.B. Saunders, 1960
Buku Teks