APA aipamena

Heilbroner, R. L. (1981). Five economic challenges. New Jersey: Prentice-Hall, Inc.

Chicago Style aipamena

Heilbroner, Robert L. Five Economic Challenges. New Jersey: Prentice-Hall, Inc, 1981.

MLA aipamena

Heilbroner, Robert L. Five Economic Challenges. New Jersey: Prentice-Hall, Inc, 1981.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.