HJERTAAS, D. G. Saskatchewan’s First Large Purple Martin Roost. Blue Jay, [S. l.], v. 74, n. 4, p. 16–17, 2016. DOI: 10.29173/bluejay360. Disponível em: https://bluejayjournal.ca/index.php/bluejay/article/view/360. Acesso em: 26 oct. 2021.