APA (7th ed.) Citation

Gill, J. P., Rose, R. S., Roberts, G. A., Johnstin, H. G., & George, R. B. (1944). Tool steels. American society for metals.

Chicago Style (17th ed.) Citation

Gill, J. P., Robert Steadman Rose, George Adams Roberts, Harry Grant Johnstin, and Robert Burns George. Tool Steels. Cleveland, O.: American society for metals, 1944.

MLA (9th ed.) Citation

Gill, J. P., et al. Tool Steels. American society for metals, 1944.