APA aipamena

Alfaro, M. d. R. (1992). Pollution a nightmare of all.

Chicago Style aipamena

Alfaro, María del Rosario. Pollution a Nightmare of All. 1992.

MLA aipamena

Alfaro, María del Rosario. Pollution a Nightmare of All. 1992.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.