Bremer B (2009). "A review of molecular phylogenetic studies of Rubiaceae". Annals of the Missouri Botanical Garden. 96: 4–26. doi:10.3417/2006197. S2CID53378010.
Bremer B, Eriksson E (2009). "Time tree of Rubiaceae: phylogeny and dating the family, subfamilies, and tribes". International Journal of Plant Sciences. 170 (6): 766–793. doi:10.1086/599077. S2CID49332892.
Bremer B (2009). "A review of molecular phylogenetic studies of Rubiaceae". Annals of the Missouri Botanical Garden. 96: 4–26. doi:10.3417/2006197. S2CID53378010.
Bremer B, Eriksson E (2009). "Time tree of Rubiaceae: phylogeny and dating the family, subfamilies, and tribes". International Journal of Plant Sciences. 170 (6): 766–793. doi:10.1086/599077. S2CID49332892.