P. Horn, S. (1989). Prehistoric fires in the Chirripó highlands of Costa Rica: Sedimentary charcoal evidence.
استشهاد بنمط شيكاغوP. Horn, Sally. Prehistoric Fires in the Chirripó Highlands of Costa Rica: Sedimentary Charcoal Evidence. 1989.
MLA استشهادP. Horn, Sally. Prehistoric Fires in the Chirripó Highlands of Costa Rica: Sedimentary Charcoal Evidence. 1989.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.