"Species Records of Coreopsis". Germplasm Resources Information Network. United States Department of Agriculture. Archived from the original on January 20, 2009. Retrieved February 9, 2011.
"Genus: Coreopsis L."Germplasm Resources Information Network. United States Department of Agriculture. January 6, 2011. Archived from the original on June 29, 2011. Retrieved February 9, 2011.
Kim, Seung-Chul; Daniel J. Crawford; Mesfin Tadesse; Mary Berbee; Fred R. Ganders; Mona Pirseyedi; Elizabeth J. Esselman (July–September 1999). "ITS sequences and phylogenetic relationships in Bidens and Coreopsis (Asteraceae)". Systematic Botany. 24 (3): 480–493. Bibcode:1999SysBo..24..480K. doi:10.2307/2419701. JSTOR2419701.
Kim, Seung-Chul; Daniel J. Crawford; Mesfin Tadesse; Mary Berbee; Fred R. Ganders; Mona Pirseyedi; Elizabeth J. Esselman (July–September 1999). "ITS sequences and phylogenetic relationships in Bidens and Coreopsis (Asteraceae)". Systematic Botany. 24 (3): 480–493. Bibcode:1999SysBo..24..480K. doi:10.2307/2419701. JSTOR2419701.
Kim, Seung-Chul; Daniel J. Crawford; Mesfin Tadesse; Mary Berbee; Fred R. Ganders; Mona Pirseyedi; Elizabeth J. Esselman (July–September 1999). "ITS sequences and phylogenetic relationships in Bidens and Coreopsis (Asteraceae)". Systematic Botany. 24 (3): 480–493. Bibcode:1999SysBo..24..480K. doi:10.2307/2419701. JSTOR2419701.
Main, Martin B.; Ginger M. Allen. "Florida State Symbols". Electronic Data Information Source. University of Florida IFAS Extension. Retrieved February 9, 2011.
"Species Records of Coreopsis". Germplasm Resources Information Network. United States Department of Agriculture. Archived from the original on January 20, 2009. Retrieved February 9, 2011.
"Genus: Coreopsis L."Germplasm Resources Information Network. United States Department of Agriculture. January 6, 2011. Archived from the original on June 29, 2011. Retrieved February 9, 2011.