{Collar, N., P. F. D. Boesman, and C.J. Sharpe (2020). Scarlet Macaw (Ara macao), version 1.0. In Birds of the World (J. del Hoyo, A. Elliott, J. Sargatal, D. A. Christie, and E. de Juana, Editors). Cornell Lab of Ornithology, Ithaca, NY, USA. https://doi.org/10.2173/bow.scamac1.01 Krev abonnement, henta 1. januar 2020
