Allen, J. E. (1979). The magnificent gateway: A layman's guide to the geology of the Columbia River Gorge. Timber Press.
Style de citation Chicago (17e éd.)Allen, John Eliot. The Magnificent Gateway: A Layman's Guide to the Geology of the Columbia River Gorge. Forest Grove, Or.: Timber Press, 1979.
Style de citation MLA (8e éd.)Allen, John Eliot. The Magnificent Gateway: A Layman's Guide to the Geology of the Columbia River Gorge. Timber Press, 1979.
Attention : ces citations peuvent ne pas être correctes à 100%.