Reinert, Stephan; Van Tassel, David L.; Schlautman, Brandon; Kane, Nolan C.; Hulke, Brent S. (October 2019). "Assessment of the biogeographical variation of seed size and seed oil traits in wild Silphium integrifolium Michx. genotypes". Plant Genetic Resources: Characterization and Utilization. 17 (5): 427–436. doi:10.1017/S1479262119000248. S2CID203409438.
Reinert, Stephan; Van Tassel, David L.; Schlautman, Brandon; Kane, Nolan C.; Hulke, Brent S. (October 2019). "Assessment of the biogeographical variation of seed size and seed oil traits in wild Silphium integrifolium Michx. genotypes". Plant Genetic Resources: Characterization and Utilization. 17 (5): 427–436. doi:10.1017/S1479262119000248. S2CID203409438.