APA

Varnes D. J., Radbruch-Hall D. H., Savage W. Z. & United States Geological Survey. (1989). Topographic and structural conditions in areas of gravitational spreading of ridges in the Western United States. Washington, DC: US Gov. Print. Office.

Chicago

Varnes David J, Radbruch-Hall Dorothy H, Savage William Z and United States Geological Survey. 1989. Topographic and structural conditions in areas of gravitational spreading of ridges in the Western United States. Washington, DC: US Gov. Print. Office.

Harvard

Varnes D. J., Radbruch-Hall D. H., Savage W. Z. and United States Geological Survey. (1989). Topographic and structural conditions in areas of gravitational spreading of ridges in the Western United States. Washington, DC: US Gov. Print. Office.

MLA

Varnes David J, Radbruch-Hall Dorothy H, Savage William Z and United States Geological Survey. Topographic and structural conditions in areas of gravitational spreading of ridges in the Western United States. Washington, DC: US Gov. Print. Office. 1989.