Dokumentuaren aipamena

APA (7th ed.) Zitazioa
Clark William Bullock, Whitney Milton, Bonsteel J. A., & Burke B. T. A. (1902). Map of Calvert county showing the Agricultural soils. U. S. Bureau of Soils.
Chicago Style (17th ed.) Zitazioa
Clark William Bullock, Whitney Milton, Bonsteel J. A., eta Burke B. T. A. Map of Calvert County Showing the Agricultural Soils. U. S. Bureau of Soils, 1902.
MLA (9th ed.) Zitazioa
Clark William Bullock, et al. Map of Calvert County Showing the Agricultural Soils. U. S. Bureau of Soils, 1902.
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