DE VRIES, Bernard. A Second Saskatchewan Record for the Ram’s-Head Lady’s-Slipper. Blue Jay, [S. l.], v. 32, n. 2, 1970. DOI: 10.29173/bluejay3937. Disponível em: https://bluejayjournal.ca/index.php/bluejay/article/view/3937. Acesso em: 2 apr. 2025.