[1]
Allenby, R.B.J.T. 1991. Rings, fields and groups: an introduction to abstract algebra. Edward Arnold.
[2]
Carter, N.C. and ebrary, Inc 2009. Visual group theory. Mathematical Association of America.
[3]
Humphreys, J.F. 1996. A course in group theory. Oxford University Press.
[4]
Scott, W.R. 1987. Group theory. Dover.