Cita APA (7th ed.)

Guba, V., & Sapir, M. (1997). Diagram groups. American Mathematical Society.

Cita Chicago (17th ed.)

Guba, Victor, i Mark Sapir. Diagram Groups. Providence, Rhode Island: American Mathematical Society, 1997.

Cita MLA (9th ed.)

Guba, Victor, i Mark Sapir. Diagram Groups. American Mathematical Society, 1997.