APA (7th ed.) Citation

Keen, M. L. (1969). The how and why wonder book of the microscope and what you see. Grosset & Dunlap.

Chicago Style (17th ed.) Citation

Keen, Martin L. The How and Why Wonder Book of the Microscope and What You See. New York: Grosset & Dunlap, 1969.

MLA (9th ed.) Citation

Keen, Martin L. The How and Why Wonder Book of the Microscope and What You See. Grosset & Dunlap, 1969.