Scott A. Taylor; David J. Anderson; Carlos B. Zavalaga and; Vicki L. Friesen (12 June 2012). "Evidence for strong assortative mating, limited gene flow, and strong differentiation across the blue-footed/Peruvian booby hybrid zone in northern Peru". Journal of Avian Biology. 43 (4): 311–324. doi:10.1111/J.1600-048X.2012.05660.X. ISSN0908-8857. WikidataQ109969571.
David Cameron Duffy (1987). "Aspects of the Ecology of Blue-Footed and Peruvian Boobies at the Limits of Their Ranges on Isla Lobos de Tierra, Peru". Waterbirds. 10 (1): 45. doi:10.2307/1521229. ISSN1524-4695. JSTOR1521229. WikidataQ57064621.
David Cameron Duffy (1987). "Aspects of the Ecology of Blue-Footed and Peruvian Boobies at the Limits of Their Ranges on Isla Lobos de Tierra, Peru". Waterbirds. 10 (1): 45. doi:10.2307/1521229. ISSN1524-4695. JSTOR1521229. WikidataQ57064621.
Scott A. Taylor; David J. Anderson; Carlos B. Zavalaga and; Vicki L. Friesen (12 June 2012). "Evidence for strong assortative mating, limited gene flow, and strong differentiation across the blue-footed/Peruvian booby hybrid zone in northern Peru". Journal of Avian Biology. 43 (4): 311–324. doi:10.1111/J.1600-048X.2012.05660.X. ISSN0908-8857. WikidataQ109969571.
David Cameron Duffy (1987). "Aspects of the Ecology of Blue-Footed and Peruvian Boobies at the Limits of Their Ranges on Isla Lobos de Tierra, Peru". Waterbirds. 10 (1): 45. doi:10.2307/1521229. ISSN1524-4695. JSTOR1521229. WikidataQ57064621.
Scott A. Taylor; David J. Anderson; Carlos B. Zavalaga and; Vicki L. Friesen (12 June 2012). "Evidence for strong assortative mating, limited gene flow, and strong differentiation across the blue-footed/Peruvian booby hybrid zone in northern Peru". Journal of Avian Biology. 43 (4): 311–324. doi:10.1111/J.1600-048X.2012.05660.X. ISSN0908-8857. WikidataQ109969571.
David Cameron Duffy (1987). "Aspects of the Ecology of Blue-Footed and Peruvian Boobies at the Limits of Their Ranges on Isla Lobos de Tierra, Peru". Waterbirds. 10 (1): 45. doi:10.2307/1521229. ISSN1524-4695. JSTOR1521229. WikidataQ57064621.