APA引文

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

Citación estilo Chicago

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

MLA引文

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

警告：这些引文格式不一定是100％准确.