APA aipamena

Petering, D. H., & Klump, V. (2003). Importance of the Great Lakes.

Chicago Style aipamena

Petering, David H., and Val Klump. Importance of the Great Lakes. 2003.

MLA aipamena

Petering, David H., and Val Klump. Importance of the Great Lakes. 2003.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.