Cita APA

Fisher, R. (1991). Heartland of a continent: America's plains and prairies. National Geographic Society.

Citación estilo Chicago

Fisher, Ron. Heartland of a Continent: America's Plains and Prairies. Washington, D.C.: National Geographic Society, 1991.

Cita MLA

Fisher, Ron. Heartland of a Continent: America's Plains and Prairies. National Geographic Society, 1991.

Warning: These citations may not always be 100% accurate.