APA (7th ed.) Citation

Spyri, J., & John Dillow. Heidi. Ladybird Books.

Chicago Style (17th ed.) Citation

Spyri, Johanna, and John Dillow. Heidi. Loughborough: Ladybird Books.

MLA (9th ed.) Citation

Spyri, Johanna, and John Dillow. Heidi. Ladybird Books.

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