Freitas, P. P., V. C. da Paz, and R. D. Navarro. “Feeding Behavior of Cockatiels in Captivity”. Brazilian Journal of Veterinary Research and Animal Science, vol. 57, no. 4, Dec. 2020, p. e168320, doi:10.11606/issn.1678-4456.bjvras.2020.168320.