APA (7th ed.) Citation

Spyri & Sebag-Montefiore. (2006). The story of Heidi. Usborne Pub.

Chicago Style (17th ed.) Citation

Spyri and Sebag-Montefiore. The Story of Heidi. London: Usborne Pub, 2006.

MLA (8th ed.) Citation

Spyri and Sebag-Montefiore. The Story of Heidi. Usborne Pub, 2006.

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