Dear, F., C. Vaughan, and A. Morales Polanco. “Current Status and Conservation of the Scarlet Macaw (Ara Macao) in the Osa Conservation Area (ACOSA), Costa Rica”. UNED Research Journal, vol. 2, no. 1, June 2010, pp. 7-21, doi:10.22458/urj.v2i1.218.