Yang (July 2016). "A supermatrix approach provides a comprehensive genus-level phylogeny for Gentianales: Phylogeny of Gentianales". Journal of Systematics and Evolution (İngilizce). 54 (4): 400-415. doi:10.1111/jse.12192.
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.
"Phylogenetic relationships within the Gentianales based on NDHF and RBCL sequences, with particular reference to the Loganiaceae". American Journal of Botany. 87 (7): 1029-1043. 2000. doi:10.2307/2657003. PMID10898781.
"Phylogenetic relationships within the Gentianales based on NDHF and RBCL sequences, with particular reference to the Loganiaceae". American Journal of Botany. 87 (7): 1029-1043. 2000. doi:10.2307/2657003. PMID10898781.