Andrade–Yucailla, V. ., Vargas Burgos, J. C. and Lima, O. (2017) “Productive performance of two phenotypes of free-range chickens in the Amazon region of Ecuador”, Revista Amazónica. Ciencia y Tecnología, 6(1), pp. 1–8. doi: 10.59410/RACYT-v06n01ep01-0075.