Cita APA

Roberts, G. A., & Cary, R. A. (1980). Tool steels. American society for metals.

Citación estilo Chicago

Roberts, George A., y Robert A. Cary. Tool Steels. Ohio: American society for metals, 1980.

Cita MLA

Roberts, George A., y Robert A. Cary. Tool Steels. American society for metals, 1980.