Spyri, J., Davenport, P. .., & Armino, M. (2011). Heidi. Oxford University Press.
Lua i Stíl Chicago (17ú heag.)Spyri, Johanna, Paul .0 Davenport, agus Monica Armino. Heidi. Oxford: Oxford University Press, 2011.
Lua MLA (8ú heag.)Spyri, Johanna, et al. Heidi. Oxford University Press, 2011.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.