APA aipamena

Calvo, G., & Somarriba, E. (1999). Timber species for shade in new and old cocoa fields.

Chicago Style aipamena

Calvo, G., y Eduardo Somarriba. Timber Species for Shade in New and Old Cocoa Fields. 1999.

MLA aipamena

Calvo, G., y Eduardo Somarriba. Timber Species for Shade in New and Old Cocoa Fields. 1999.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.