APA aipamena

Knutson, C. (1998). How to reduce drought risk. Western Drought Cooodination Council.

Chicago Style aipamena

Knutson, Cody. How to Reduce Drought Risk. Western Drought Cooodination Council, 1998.

MLA aipamena

Knutson, Cody. How to Reduce Drought Risk. Western Drought Cooodination Council, 1998.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.