APA

Cobban W. A., Erdmann C. E., Lemke R. W. & Maughan E. K. (1976). Type Sections and Stratigraphy of the Members of the Blackleaf and Marias River Formations (Cretaceous) of the Sweetgrass Arch, Montana. Washington: United States Government Printing Office.

Chicago

Cobban William Aubrey, Erdmann C E, Lemke Richard W and Maughan Edwin K. 1976. Type Sections and Stratigraphy of the Members of the Blackleaf and Marias River Formations (Cretaceous) of the Sweetgrass Arch, Montana. Washington: United States Government Printing Office.

Harvard

Cobban W. A., Erdmann C. E., Lemke R. W. and Maughan E. K. (1976). Type Sections and Stratigraphy of the Members of the Blackleaf and Marias River Formations (Cretaceous) of the Sweetgrass Arch, Montana. Washington: United States Government Printing Office.

MLA

Cobban William Aubrey, Erdmann C E, Lemke Richard W and Maughan Edwin K. Type Sections and Stratigraphy of the Members of the Blackleaf and Marias River Formations (Cretaceous) of the Sweetgrass Arch, Montana. Washington: United States Government Printing Office. 1976.