@book{Allenby_1991, address={London}, edition={2nd ed}, title={Rings, fields and groups: an introduction to abstract algebra}, publisher={Edward Arnold}, author={Allenby, R. B. J. T.}, year={1991} }
@book{Wallace_1998, address={London}, title={Groups, rings, and fields}, volume={Springer undergraduate mathematics series}, publisher={Springer}, author={Wallace, D. A. R.}, year={1998} }
@book{Whitelaw_1995, address={London}, edition={3rd ed}, title={Introduction to abstract algebra}, publisher={Blackie}, author={Whitelaw, Thomas A.}, year={1995} }