Magnus, W., Karrass, A. j. a., & Solitar, D. j. a. (1966). Combiantorial group theory: Presentations of groups of generators and relations. Inter-Science Pub.

Magnus, Wilhelm, Abraham joint auth Karrass, and Donald joint auth Solitar. Combiantorial Group Theory: Presentations of Groups of Generators and Relations. New York: Inter-Science Pub, 1966.

Magnus, Wilhelm, et al. Combiantorial Group Theory: Presentations of Groups of Generators and Relations. Inter-Science Pub, 1966.