Kristy Halverson, Stephen B. Heard, John D. Nason and John O. Stireman, III, Origins, distribution, and local co-occurrence of polyploid cytotypes in Solidago altissima (Asteraceae), American Journal of Botany, 2008, 95 (1): 50–58, PMID 21632314, doi:10.3732/ajb.95.1.50
Kristy Halverson, Stephen B. Heard, John D. Nason and John O. Stireman, III, Origins, distribution, and local co-occurrence of polyploid cytotypes in Solidago altissima (Asteraceae), American Journal of Botany, 2008, 95 (1): 50–58, PMID 21632314, doi:10.3732/ajb.95.1.50