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Ehrlich, Paul (1988). "Brood Patches". web.stanford.edu. Archived from the original on 2015-05-12. Retrieved 2020-08-03. https://web.stanford.edu/group/stanfordbirds/text/essays/Brood_Patches.html
Ehrlich, Paul (1988). "Brood Patches". web.stanford.edu. Archived from the original on 2015-05-12. Retrieved 2020-08-03. https://web.stanford.edu/group/stanfordbirds/text/essays/Brood_Patches.html
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Ehrlich, Paul (1988). "Brood Patches". web.stanford.edu. Archived from the original on 2015-05-12. Retrieved 2020-08-03. https://web.stanford.edu/group/stanfordbirds/text/essays/Brood_Patches.html