Nelson, S. P., & Nelson, T. W. (1997). Umbrella guide to exploring the Columbia-Snake River inland waterway. Epicenter Press.
Cita Chicago Style (17a ed.)Nelson, Sharlene P., y Ted W. Nelson. Umbrella Guide to Exploring the Columbia-Snake River Inland Waterway. Kenmore, WA: Epicenter Press, 1997.
Cita MLA (8a ed.)Nelson, Sharlene P., y Ted W. Nelson. Umbrella Guide to Exploring the Columbia-Snake River Inland Waterway. Epicenter Press, 1997.
Precaución: Estas citas no son 100% exactas.