APA (7th ed.) Citation

Harpster, H. T., & Gay, Z. (1948). The insect world (2nd printing.). Viking.

Chicago Style (17th ed.) Citation

Harpster, Hilda Thankful, and Zhenya Gay. The Insect World. 2nd printing. New York: Viking, 1948.

MLA (9th ed.) Citation

Harpster, Hilda Thankful, and Zhenya Gay. The Insect World. 2nd printing. Viking, 1948.