Template:Del Guacchio & Caputo, 2020
- Del Guacchio, E. & Caputo, P. 2020. Splitting Asperula (Rubiaceae): a proposal for consistency purposes within sections Cynanchicae, Thliphthisa and Hexaphylla. Plant Biosystems 154(5): 766–782. DOI: 10.1080/11263504.2020.1804008
