एपीए उद्धरण

Field, R. M. (1936). Natural resources of the United States: A basics for economic Geography. New York: Barnes and Noble.

शिकागो स्टाइल उद्धरण

Field, Richard M. Natural Resources of the United States: A Basics for Economic Geography. New York: Barnes and Noble, 1936.

एमएलए उद्धरण

Field, Richard M. Natural Resources of the United States: A Basics for Economic Geography. New York: Barnes and Noble, 1936.