(en) Klein, D.E., Moreira Gomes, V., Da Silva-Neto, S.J. et Da Cunha, M., The Structure of Colleters in Several Species of Simira (Rubiaceae), vol. 94, Annals of Botany, , 733–740 p. (DOI10.1093/aob/mch198, lire en ligne), chap. 5.
(en) Klein, D.E., Moreira Gomes, V., Da Silva-Neto, S.J. et Da Cunha, M., The Structure of Colleters in Several Species of Simira (Rubiaceae), vol. 94, Annals of Botany, , 733–740 p. (DOI10.1093/aob/mch198, lire en ligne), chap. 5.