Laine, D. (2012). Frommer's national parks of the american west (8.).
Cita Chicago Style (17a ed.)Laine, Don. Frommer's National Parks of the American West. 8. 2012.
Cita MLA (8a ed.)Laine, Don. Frommer's National Parks of the American West. 8. 2012.
Precaución: Estas citas no son 100% exactas.