APA

Gill J. R., Cobban W. A. & Schultz L. G. (1972). Stratigraphy and Composition of the Sharon Springs Member of the Pierre Shale in Western Kansas. Washington: United States Government Printing Office.

Chicago

Gill James R, Cobban William Aubrey and Schultz Leonard G. 1972. Stratigraphy and Composition of the Sharon Springs Member of the Pierre Shale in Western Kansas. Washington: United States Government Printing Office.

Harvard

Gill J. R., Cobban W. A. and Schultz L. G. (1972). Stratigraphy and Composition of the Sharon Springs Member of the Pierre Shale in Western Kansas. Washington: United States Government Printing Office.

MLA

Gill James R, Cobban William Aubrey and Schultz Leonard G. Stratigraphy and Composition of the Sharon Springs Member of the Pierre Shale in Western Kansas. Washington: United States Government Printing Office. 1972.