Cita APA (7th ed.)

Hines-Stephens, S., & Spyri, J. (2002). Heidi. Scholastic.

Cita Chicago (17th ed.)

Hines-Stephens, Sarah, i Johanna Spyri. Heidi. New York: Scholastic, 2002.

Cita MLA (9th ed.)

Hines-Stephens, Sarah, i Johanna Spyri. Heidi. Scholastic, 2002.