APA (7th ed.) Citation

Geis, D. (1960). The how and why wonder book of dinosaurs. Wonder Books.

Chicago Style (17th ed.) Citation

Geis, Darlene. The How and Why Wonder Book of Dinosaurs. New York: Wonder Books, 1960.

MLA (9th ed.) Citation

Geis, Darlene. The How and Why Wonder Book of Dinosaurs. Wonder Books, 1960.