APA (7th ed.) Citation

Notkin, J. J., & Gulkin, S. (1970). The how and why wonder book of machines. Grosset & Dunlap.

Chicago Style (17th ed.) Citation

Notkin, Jerome J., and Sidney Gulkin. The How and Why Wonder Book of Machines. New York: Grosset & Dunlap, 1970.

MLA (9th ed.) Citation

Notkin, Jerome J., and Sidney Gulkin. The How and Why Wonder Book of Machines. Grosset & Dunlap, 1970.