Citazione Stile APA (7a Edizione)

ZIMMERMANN, E. W. (1964). Introduction to world resources. Harper & Row.

Citazione stile Chigago Style (17a edizione)

ZIMMERMANN, Erich W. Introduction to World Resources. New York: Harper & Row, 1964.

Citatione MLA (9a ed.)

ZIMMERMANN, Erich W. Introduction to World Resources. Harper & Row, 1964.