Canadensys: University of Alberta Vascular Plant Herbarium (ALTA-VP)
Canadensys, operated from the Université de Montréal Biodiversity Centre
"24578 - Aster sagittifolius Wedem. ex Willd. var. drummondii ( Lindl. ex Hook. ) Shinners, University of Alberta Vascular Plant Herbarium." University of Alberta Museums Search Site, https://search.museums.ualberta.ca/12-150266. Accessed 18 Apr. 2025.