APA način citiranja

Calderón, J., Alán, E., & Barrantes, U. (2006). Structure, size and production of weed seeds in the humid tropic.

Čikaški stil citiranja

Calderón, Juan, Elizabeth Alán, i Uriel Barrantes. Structure, Size and Production of Weed Seeds in the Humid Tropic. 2006.

MLA način citiranja

Calderón, Juan, Elizabeth Alán, i Uriel Barrantes. Structure, Size and Production of Weed Seeds in the Humid Tropic. 2006.