APA (7th ed.) Citation

Spyri, J., Asor, M., & Maury, M. J. (1976). Heidi: Estudia. Betis.

Chicago Style (17th ed.) Citation

Spyri, Johanna, Mercedes Asor, and María José Maury. Heidi: Estudia. Barcelona: Betis, 1976.

MLA (9th ed.) Citation

Spyri, Johanna, et al. Heidi: Estudia. Betis, 1976.