APA (7th ed.) Citation

Allen, J. E. (1979). The magnificent gateway: A layman's guide to the geology of the Columbia River Gorge. Timber Press.

Chicago Style (17th ed.) Citation

Allen, John Eliot. The Magnificent Gateway: A Layman's Guide to the Geology of the Columbia River Gorge. Forest Grove, Or.: Timber Press, 1979.

MLA (9th ed.) Citation

Allen, John Eliot. The Magnificent Gateway: A Layman's Guide to the Geology of the Columbia River Gorge. Timber Press, 1979.