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(en) Gregory T. Cushman, «“The Most Valuable Birds in the World”: International Conservation Science and the Revival of Peru's Guano Industry, 1909–1965», Environmental History, vol.10, no3, , p.477–509 (ISSN1084-5453 et 1930-8892, DOI10.1093/envhis/10.3.477, lire en ligne, consulté le )
(en) Gregory T. Cushman, «“The Most Valuable Birds in the World”: International Conservation Science and the Revival of Peru's Guano Industry, 1909–1965», Environmental History, vol.10, no3, , p.477–509 (ISSN1084-5453 et 1930-8892, DOI10.1093/envhis/10.3.477, lire en ligne, consulté le )