Franck, A.R., Lewis, P.A., Oberli, A., Haynes-Sutton, A., Rose, P.E. . and Campbell, K.C.S.E. 2017.

The Jamaican endemic Exostema orbiculatum belongs to Erithalis (Rubiaceae)

. Phytotaxa. 297, 3 (Mar. 2017), 273–281. DOI:https://doi.org/10.11646/phytotaxa.297.3.6.