APA-viite (7. p.)
Spence, M. W. (1971). Some lithic assemblages of western Zacatecas and Durango, México. University Museum, Southern Illinois University.
Chicago-viite (17. p.)
Spence, Michael W. Some Lithic Assemblages of Western Zacatecas and Durango, México. Carbondale, Illinois: University Museum, Southern Illinois University, 1971.
MLA-viite (9. p.)
Spence, Michael W. Some Lithic Assemblages of Western Zacatecas and Durango, México. University Museum, Southern Illinois University, 1971.
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