Haggard, Kristina K.; Tiffney, Bruce H. (). „The Flora of the Early Miocene Brandon Lignite, Vermont, USA. VIII. Caldesia (Alismataceae)”. American Journal of Botany. Botanical Society of America. 84 (2): 239–252. doi:10.2307/2446086. JSTOR2446086.
jstor.org
Haggard, Kristina K.; Tiffney, Bruce H. (). „The Flora of the Early Miocene Brandon Lignite, Vermont, USA. VIII. Caldesia (Alismataceae)”. American Journal of Botany. Botanical Society of America. 84 (2): 239–252. doi:10.2307/2446086. JSTOR2446086.