Citazione APA

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

Stile di citazione Chicago

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

Citazione MLA

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