Vielbig, K. (1997). Mount St. Helens National Volcanic Monument: A complete guide for hiking, skiing, climbing & nature viewing. The Mountaineers.
Cita Chicago Style (17a ed.)Vielbig, Klindt. Mount St. Helens National Volcanic Monument: A Complete Guide for Hiking, Skiing, Climbing & Nature Viewing. Seattle, WA: The Mountaineers, 1997.
Cita MLA (8a ed.)Vielbig, Klindt. Mount St. Helens National Volcanic Monument: A Complete Guide for Hiking, Skiing, Climbing & Nature Viewing. The Mountaineers, 1997.
Precaución: Estas citas no son 100% exactas.