Παραπομπή APA

Calvo, J., Quesada, C., Sánchez, A., González, P., Watson, V., & Bolaños, R. (1999). Forest cover in protected areas of Costa Rica between 1986/7 and 1996/7.

Παραπομπή Chicago Style

Calvo, Julio, Carlos Quesada, Arturo Sánchez, Pablo González, Vicente Watson, και Rafael Bolaños. Forest Cover in Protected Areas of Costa Rica between 1986/7 and 1996/7. 1999.

Παραπομπή MLA

Calvo, Julio, et al. Forest Cover in Protected Areas of Costa Rica between 1986/7 and 1996/7. 1999.

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