PAZ-SOLDÁN, L.; JAHNCKE, J. The Humboldt Penguin population Spheniscus humboldti on Pachacamac Island and El Niño event 1997-98. Boletin Instituto del Mar del Perú, [S. l.], v. 17, n. 1-2, p. 75–80, 1998. Disponível em: https://revistas.imarpe.gob.pe/index.php/boletin/article/view/176. Acesso em: 7 nov. 2026.