APA引文

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

芝加哥风格引文

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

MLA引文

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

警告:这些引文格式不一定是100%准确.