APA (7th ed.) Citation

Nilsen, T. H. (1993). Stratigraphy of the Cretaceous Hornbrook Formation, southern Oregon and northern California: A stratigraphic division of the Hornbrook Formation into five nonmarine and marine members. U.S. Government Print. Office.

Chicago Style (17th ed.) Citation

Nilsen, Tor Helge. Stratigraphy of the Cretaceous Hornbrook Formation, Southern Oregon and Northern California: A Stratigraphic Division of the Hornbrook Formation into Five Nonmarine and Marine Members. Washington: U.S. Government Print. Office, 1993.

MLA (9th ed.) Citation

Nilsen, Tor Helge. Stratigraphy of the Cretaceous Hornbrook Formation, Southern Oregon and Northern California: A Stratigraphic Division of the Hornbrook Formation into Five Nonmarine and Marine Members. U.S. Government Print. Office, 1993.