1.
Cameron, Peter J. Introduction to algebra [Internet]. 2nd ed. New York: Oxford University Press; 2008. Available from: http://ezproxy.library.qmul.ac.uk/login?url=http://www.vlebooks.com/vleweb/product/openreader?id=QMUL&isbn=9780191566226&uid=^u
2.
Ledermann, Walter, Weir, Alan J. Introduction to group theory. 2nd ed. Harlow: Longman; 1996.