Hammond, Eugene R.
McGraw-Hill, 1989
Buku Teks
Seedhouse, David
Sage Publications, 2019
eBooks
edited with introductions by Michael Bromley, Tom O'Malley
Routledge , 1997
Buku Teks
David J. Whittaker
Routledge, 2001
Buku Teks
edited by Kenneth G. Elzinga
Harper & Row, 1972
Buku Teks