National Geographic Society (United States). Cartographic Division, Grosvenor, G. M., Garrett,Wilbur E, Darley,Richard J, & Shupe, J. F. (1980). Mexico and Central America [cartographic material]. The Society.
Chicago-referens (17:e uppl.)National Geographic Society (United States). Cartographic Division, Gilbert M. Grosvenor, Garrett,Wilbur E, Darley,Richard J, och John F. Shupe. Mexico and Central America [cartographic Material]. Washington, D.C: The Society, 1980.
MLA-referens (8:e uppl.)National Geographic Society (United States). Cartographic Division, et al. Mexico and Central America [cartographic Material]. The Society, 1980.
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