Survey, U. S. G. (1981). Stratigraphy and sedimentary facies of the Madison limestone and associated rocks in parts of Montana, North Dakota, South Dakota, Wyoming and Nebraska. Denver, Colo. : US Geological Survey.
Չիկագոյի ոճի (17րդ խմբ.) մեջբերումSurvey, United States. Geological. Stratigraphy and Sedimentary Facies of the Madison Limestone and Associated Rocks in Parts of Montana, North Dakota, South Dakota, Wyoming and Nebraska. Denver, Colo. : US Geological Survey, 1981.
MLA (9րդ խմբ.) ՄեջբերումSurvey, United States. Geological. Stratigraphy and Sedimentary Facies of the Madison Limestone and Associated Rocks in Parts of Montana, North Dakota, South Dakota, Wyoming and Nebraska. Denver, Colo. : US Geological Survey, 1981.
Զգուշացում. այս մեջբերումները միշտ չէ, որ կարող են 100% ճշգրիտ լինել.