APA aipamena

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

Chicago Style aipamena

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

MLA aipamena

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

Kontuz: berrikusi erreferentzia hauek erabili aurretik.