Fisher, R. (1991). Heartland of a continent: America's plains and prairies. National Geographic Society.
Chicago Style (17th ed.) CitationFisher, Ron. Heartland of a Continent: America's Plains and Prairies. Washington, D.C.: National Geographic Society, 1991.
MLA (9th ed.) CitationFisher, Ron. Heartland of a Continent: America's Plains and Prairies. National Geographic Society, 1991.
Warning: These citations may not always be 100% accurate.