APA (7th ed.) Zitazioa

Kumekawa. The First Serious Optimist. Princeton University Press.

Chicago Style (17th ed.) Zitazioa

Kumekawa. The First Serious Optimist. Princeton University Press.

MLA (9th ed.) Zitazioa

Kumekawa. The First Serious Optimist. Princeton University Press.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.