APA (7th ed.) Citation

Beaumont, R. A., & Pierce, R. S. (1961). Torsion free groups of rank two. American Mathematical Society.

Chicago Style (17th ed.) Citation

Beaumont, Ross A., and Robert Stanley Pierce. Torsion Free Groups of Rank Two. Providence, Rhode Island: American Mathematical Society, 1961.

MLA (9th ed.) Citation

Beaumont, Ross A., and Robert Stanley Pierce. Torsion Free Groups of Rank Two. American Mathematical Society, 1961.