Fox Squirrels and Gray Squirrels in Illinois. Illinois Natural History Survey Bulletin, Champaign, IL, v. 23, n. 1-5, p. 449–549, 1945. DOI: 10.21900/j.inhs.v23.203. Disponível em: https://iopn.library.illinois.edu/journals/inhs/article/view/203.. Acesso em: 18 may. 2024.