Jahncke, J., and L. Paz-Soldán. “Breeding Biology of Peruvian Guano-Producing Seabirds and Its Relationship With Peruvian Anchovy Availability”. Boletin Instituto Del Mar Del Perú, vol. 17, no. 1-2, Dec. 1998, pp. 55-66, https://revistas.imarpe.gob.pe/index.php/boletin/article/view/179.