Verbatim text: Downie, S. R. and K. E. Denford. 1988. Taxonomy of Arnica (Asteraceae) subgenus Arctica. Rhodora 90: 245–275.
Author: Downie, S.R., Denford, K.E.
Year: 1988
Title: Taxonomy of Arnica (Asteraceae) subgenus Arctica
Journal: Rhodora
Volume: 90
Pages: 245–275