Lammers (Wawra) 2005 - Lammers TG (2005) Revision of Delissea (Campanulaceae-Lobelioideae). Systematic Botany Monographs 73: 1-75. Retrieved from http://www.jstor.org/stable/25027934
There is no corrections for Delissea subcordata subsp. obtusifolia yet.