Rotman, Joseph (1995). 《An introduction to the theory of groups》. Graduate Texts in Mathematics (영어) 148 4판. Springer-Verlag. ISBN978-0-387-94285-8. MR1307623. Zbl0810.20001.
Rotman, Joseph (1995). 《An introduction to the theory of groups》. Graduate Texts in Mathematics (영어) 148 4판. Springer-Verlag. ISBN978-0-387-94285-8. MR1307623. Zbl0810.20001.