APA (7th ed.) Citation

Tritten, C., & Spyri, J. (1939). Heidi's children. Grosset & Dunlap.

Chicago Style (17th ed.) Citation

Tritten, Charles, and Johanna Spyri. Heidi's Children. New York: Grosset & Dunlap, 1939.

MLA (9th ed.) Citation

Tritten, Charles, and Johanna Spyri. Heidi's Children. Grosset & Dunlap, 1939.