Ellison, Nick W.; Liston, Aaron; Steiner, Jeffrey J.; Williams, Warren M.; Taylor, Norman L. (2006). "Molecular phylogenetics of the clover genus (Trifolium—Leguminosae)". Molecular Phylogenetics and Evolution. 39 (3): 688–705. Bibcode:2006MolPE..39..688E. doi:10.1016/j.ympev.2006.01.004. PMID16483799.
Vižintin, Liliana; Javornik, Branka; Bohanec, Borut (2006). "Genetic characterization of selected Trifolium species as revealed by nuclear DNA content and ITS rDNA region analysis". Plant Science. 170 (4): 859–866. Bibcode:2006PlnSc.170..859V. doi:10.1016/j.plantsci.2005.12.007.
Oertel, Everett (1967). Beekeeping in the United States. U.S. Department of Agriculture. p.16. Archived from the original on 2023-01-16. Retrieved 2022-03-11.
Ellison, Nick W.; Liston, Aaron; Steiner, Jeffrey J.; Williams, Warren M.; Taylor, Norman L. (2006). "Molecular phylogenetics of the clover genus (Trifolium—Leguminosae)". Molecular Phylogenetics and Evolution. 39 (3): 688–705. Bibcode:2006MolPE..39..688E. doi:10.1016/j.ympev.2006.01.004. PMID16483799.
Vižintin, Liliana; Javornik, Branka; Bohanec, Borut (2006). "Genetic characterization of selected Trifolium species as revealed by nuclear DNA content and ITS rDNA region analysis". Plant Science. 170 (4): 859–866. Bibcode:2006PlnSc.170..859V. doi:10.1016/j.plantsci.2005.12.007.
Ellison, Nick W.; Liston, Aaron; Steiner, Jeffrey J.; Williams, Warren M.; Taylor, Norman L. (2006). "Molecular phylogenetics of the clover genus (Trifolium—Leguminosae)". Molecular Phylogenetics and Evolution. 39 (3): 688–705. Bibcode:2006MolPE..39..688E. doi:10.1016/j.ympev.2006.01.004. PMID16483799.
Oertel, Everett (1967). Beekeeping in the United States. U.S. Department of Agriculture. p.16. Archived from the original on 2023-01-16. Retrieved 2022-03-11.
"Shamrock (Oxalis)". Fine Gardening. Archived from the original on March 1, 2017. Retrieved February 28, 2017.