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APA (7th ed.) Zitazioa
(1899). Map showing location and extent of the forest reserves and national parks in Western United States. U. S. Geological Survey.
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Chicago Style (17th ed.) Zitazioa
Map Showing Location and Extent of the Forest Reserves and National Parks in Western United States. U. S. Geological Survey, 1899.
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MLA (9th ed.) Zitazioa
Map Showing Location and Extent of the Forest Reserves and National Parks in Western United States. U. S. Geological Survey, 1899.
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Kontuz: berrikusi erreferentzia hauek erabili aurretik.