APA (7th ed.) Zitazioa

Fisher, G. D. The teacher's book of nature study.

Chicago Style (17th ed.) Zitazioa

Fisher, G. D. The Teacher's Book of Nature Study.

MLA (9th ed.) Zitazioa

Fisher, G. D. The Teacher's Book of Nature Study.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.