APA aipamena

Pacheco León, F. (1993). The Costa Rican environmental paradox.

Chicago Style aipamena

Pacheco León, Freddy. The Costa Rican Environmental Paradox. 1993.

MLA aipamena

Pacheco León, Freddy. The Costa Rican Environmental Paradox. 1993.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.