Dokumentuaren aipamena

APA (7th ed.) Zitazioa
Leverett Frank. (1929). Map of the surficial deposits of the lake superior region. U. S. Geological Survey.
Chicago Style (17th ed.) Zitazioa
Leverett Frank. Map of the Surficial Deposits of the Lake Superior Region. U. S. Geological Survey, 1929.
MLA (9th ed.) Zitazioa
Leverett Frank. Map of the Surficial Deposits of the Lake Superior Region. U. S. Geological Survey, 1929.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.