APA (7th ed.) Zitazioa

Purves,. (1977). Trace Element contamination of the environ. Elsevier.

Chicago Style (17th ed.) Zitazioa

Purves. Trace Element Contamination of the Environ. Amsterdam: Elsevier, 1977.

MLA (9th ed.) Zitazioa

Purves. Trace Element Contamination of the Environ. Elsevier, 1977.