Sex Ratios and Age Ratios in North American Ducks. Illinois Natural History Survey Bulletin, Champaign, IL, v. 27, n. 1-6, p. 391–486, 1961. DOI: 10.21900/j.inhs.v27.175. Disponível em: https://iopn.library.illinois.edu/journals/inhs/article/view/175.. Acesso em: 16 may. 2024.