Eskilson, Stephen, author
Laurence King , 2012
Buku Teks
Young, James O., author
Blackwell Publishing, 2008
Buku Teks
Young, James O.
Wiley-Blackwell Pub., 2010
Buku Teks
Hewison, Robert, 1943-, author
Methuen, 1995
Buku Teks
Marshall, Peter, author
Wiley-Blackwell, 2014
Buku Teks