Struwe, Lena. (2002). Encyclopedia of Life Sciences Gentianales (Coffees, Dogbanes, Gentians and Milkweeds)(en inglés). doi:10.1038/npg.els.0003732.
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(en inglés)161 (2): 105-121. doi:10.1111/j.1095-8339.2009.00996.x.
Backlund M, Oxelman B, Bremer B (2000). «Phylogenetic relationships within the Gentianales based on NDHF and RBCL sequences, with particular reference to the Loganiaceae». American Journal of Botany87 (7): 1029-1043. JSTOR2657003. PMID10898781. S2CID15433433. doi:10.2307/2657003.
Backlund M, Oxelman B, Bremer B (2000). «Phylogenetic relationships within the Gentianales based on NDHF and RBCL sequences, with particular reference to the Loganiaceae». American Journal of Botany87 (7): 1029-1043. JSTOR2657003. PMID10898781. S2CID15433433. doi:10.2307/2657003.
nih.gov
ncbi.nlm.nih.gov
Backlund M, Oxelman B, Bremer B (2000). «Phylogenetic relationships within the Gentianales based on NDHF and RBCL sequences, with particular reference to the Loganiaceae». American Journal of Botany87 (7): 1029-1043. JSTOR2657003. PMID10898781. S2CID15433433. doi:10.2307/2657003.
Backlund M, Oxelman B, Bremer B (2000). «Phylogenetic relationships within the Gentianales based on NDHF and RBCL sequences, with particular reference to the Loganiaceae». American Journal of Botany87 (7): 1029-1043. JSTOR2657003. PMID10898781. S2CID15433433. doi:10.2307/2657003.