APA (7th ed.) Citation

Rockwell, A. F., & Rockwell, H. (1972). Machines. Macmillan.

Chicago Style (17th ed.) Citation

Rockwell, Anne F., and Harlow Rockwell. Machines. New York: Macmillan, 1972.

MLA (9th ed.) Citation

Rockwell, Anne F., and Harlow Rockwell. Machines. Macmillan, 1972.

Warning: These citations may not always be 100% accurate.