Παραπομπή APA

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

Παραπομπή Chicago Style

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

Παραπομπή MLA

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