APA (7th ed.) Citation

Spyri, J., & Hall, E. (1995). Heidi. Penguin Books.

Chicago Style (17th ed.) Citation

Spyri, Johanna, and Eileen Hall. Heidi. London: Penguin Books, 1995.

MLA (8th ed.) Citation

Spyri, Johanna, and Eileen Hall. Heidi. Penguin Books, 1995.

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