Cita APA

Fisher, R. A. S. n. 1., & Fisher, R. A. S. n. 1. (1991). Heartland of a continent: America' s plains and prairies. Washington, D.C.: National Geographic Society.

Citación estilo Chicago

Fisher, Ronald Aylmer Sir n. 1890, y Ronald Aylmer Sir n. 1890 Fisher. Heartland of a Continent: America' S Plains and Prairies. Washington, D.C.: National Geographic Society, 1991.

Cita MLA

Fisher, Ronald Aylmer Sir n. 1890, y Ronald Aylmer Sir n. 1890 Fisher. Heartland of a Continent: America' S Plains and Prairies. Washington, D.C.: National Geographic Society, 1991.