Ehrend. (Sibth. & Sm.) 1974 - Heywood VH (1974) Flora Europaea. Notulae Systematicae ad Floram Europaeam spectantes. No. 15. Botanical Journal of the Linnean Society 68(4): 267-281. doi: 10.1111/j.1095-8339.1974.tb01978.x.
There is no corrections for Asperula purpurea subsp. apiculata yet.