• Binz (1986), S.506
• CCDB - Link (18.8.2022)
• Flora Helvetica (2012), Nr.2374a
• Flora of North America - Link (18.8.2022)
• Hess (1976ff), Bd. 3, S.207
• info flora - Link (18.8.2022)
• Markgraf (1981), S.256ff
• Oberdorfer (2001), Nr.143
• Rothmaler (2002), S.137
• Tela Botanica - Link (18.8.2022)
• World Flora Online - Link (18.8.2022)

Foto: Robert H. Mohlenbrock @ USDA-NRCS PLANTS Database / USDA NRCS. 1995. Northeast wetland flora: Field office guide to plant species. Northeast National Technical Center, Chester., Public domain, via Wikimedia Commons