HARMS, V. L. Bur oak - An uncommon native tree in Saskatchewan. Blue Jay, [S. l.], v. 60, n. 2, 2002. DOI: 10.29173/bluejay5683. Disponível em: https://bluejayjournal.ca/index.php/bluejay/article/view/5683. Acesso em: 27 jun. 2022.