Knaus, R.M. 1990. Estimates of Oil-Soaked Carcasses of the Magellanic Penguin (Spheniscus magellanicus) on the eastern shore of Península Valdés, Chubut Province, Argentina. El Hornero. 13, 2 (Sep. 1990), 171–173. DOI:https://doi.org/10.56178/eh.v13i2.1109.