Cita APA (7a ed.)

Spyri, J. (1995). Heidi. Penguin Books.

Cita Chicago Style (17a ed.)

Spyri, Johanna. Heidi. London [etc.]: Penguin Books, 1995.

Cita MLA (9a ed.)

Spyri, Johanna. Heidi. Penguin Books, 1995.