MLA

Wehrfritz, Bertram A. F, and B.A.F Wehrfritz. Group and Ring Theoretic Properties of Polycyclic Groups. Springer London, 2009.

APA

Wehrfritz, B. A. F, & Wehrfritz, B. (2009). Group and Ring Theoretic Properties of Polycyclic Groups. Springer London.

Chicago

Wehrfritz, Bertram A. F., and B.A.F Wehrfritz. Group and Ring Theoretic Properties of Polycyclic Groups. : Springer London, 2009.