Stein, Theodore J.
Columbia University Press, 2001
Buku Teks
edited and introduced by Andrew Shonfield and Stella Shaw
Heinemann Educational Books, 1972
Buku Teks
edited by Peter Dwyer, Sandra M I Shaw
Sage, 2013
Buku Teks
Editor Frederick A. Olafson
A Spectrum book, 1961
Buku Teks SO
Titmuss, Richard M
Longmans Green and Co, 1950
Buku Teks