PÉREZ-RIVERA, R. A. Changes in the Breeding Habits and Season of the Cave Swallow (Petrochelidon fulva) in Puerto Rico. Revista Umbral, [S. l.], n. 1, p. 160-168, 2017. Disponível em: https://revistas.upr.edu/index.php/umbral/article/view/8475. Acesso em: 24 ene. 2022.