Dokumentuaren aipamena

APA (7th ed.) Zitazioa
Estados Unidos Geological Survey. (19). Map showing intensity of mineralization by contours. U. S. Geological Survey.
Chicago Style (17th ed.) Zitazioa
Estados Unidos Geological Survey. Map Showing Intensity of Mineralization by Contours. U. S. Geological Survey, 19.
MLA (9th ed.) Zitazioa
Estados Unidos Geological Survey. Map Showing Intensity of Mineralization by Contours. U. S. Geological Survey, 19.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.