HOUSTON, Stuart. Mallard Nesting in Barn at Langenburg. Blue Jay, [S. l.], v. 15, n. 4, 1957. DOI: 10.29173/bluejay1715. Disponível em: https://bluejayjournal.ca/index.php/bluejay/article/view/1715. Acesso em: 4 apr. 2025.