Literature

• Fingal, J.F. 1984. Rubiaceae. Flora of the Netherlands Antilles 3: 378-409.
• Rojer, A. 1997. Biological Inventory of Saba. 87 pp. CARMABI Foundation, Curaçao.
• The Plant List 2013. The Plant List version 1.1. [link]

Literature references linked to higher taxa

• Encyclopedia of Life. [link] (Rubiaceae)