APA (7th ed.) Citation

Lobel, A., & Lobel, A. (1979). A treeful of pigs. Greenwillow Books.

Chicago Style (17th ed.) Citation

Lobel, Arnold, and Anita Lobel. A Treeful of Pigs. New York: Greenwillow Books, 1979.

MLA (8th ed.) Citation

Lobel, Arnold, and Anita Lobel. A Treeful of Pigs. Greenwillow Books, 1979.

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