APA aipamena

(2011). Annual editions: Environment 2010/2011. United States: McGraw-Hill.

Chicago Style aipamena

Annual Editions: Environment 2010/2011. United States: McGraw-Hill, 2011.

MLA aipamena

Annual Editions: Environment 2010/2011. United States: McGraw-Hill, 2011.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.