Angiosperm Phylogeny Group (2009), "An update of the Angiosperm Phylogeny Group classification for the orders and families of flowering plants: APG III", Botanical Journal of the Linnean Society, 161 (2): 105–121, doi:10.1111/j.1095-8339.2009.00996.x, hdl:10654/18083
Nowicke, Joan W.; Skvarla, John J. (July 1982). "Pollen Morphology and the Relationships of Circaeaster, of Kingdonia, and of Sargentodoxa to the Ranunculales". American Journal of Botany. 69 (6). Botanical Society of America: 990–998. doi:10.2307/2442896. JSTOR2442896.
Angiosperm Phylogeny Group (2009), "An update of the Angiosperm Phylogeny Group classification for the orders and families of flowering plants: APG III", Botanical Journal of the Linnean Society, 161 (2): 105–121, doi:10.1111/j.1095-8339.2009.00996.x, hdl:10654/18083
Nowicke, Joan W.; Skvarla, John J. (July 1982). "Pollen Morphology and the Relationships of Circaeaster, of Kingdonia, and of Sargentodoxa to the Ranunculales". American Journal of Botany. 69 (6). Botanical Society of America: 990–998. doi:10.2307/2442896. JSTOR2442896.