Spence, M. W. (1971). Some lithic assemblages of western Zacatecas and Durango, México. University Museum, Southern Illinois University.
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Chicago Style (17th ed.) Zitazioa
Spence, Michael W. Some Lithic Assemblages of Western Zacatecas and Durango, México. Carbondale, Illinois: University Museum, Southern Illinois University, 1971.
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MLA (9th ed.) Zitazioa
Spence, Michael W. Some Lithic Assemblages of Western Zacatecas and Durango, México. University Museum, Southern Illinois University, 1971.
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Kontuz: berrikusi erreferentzia hauek erabili aurretik.