Literature

• Boldingh, I. 1909. The flora of the Dutch West Indian Islands St. Eustatius, Saba and St. Martin. 321 pp. E.j. Brill., Leiden.
• Bos, O.G., Bakker, P.A.J., Henkens, R., Debrot, A.O. & Freitas, J. de 2018. Preliminary checklist of extant endemic species and subspecies of the windward Saba and the Saba Bank. 65. Wageningen Marine Research Report no. C067.18.
• Fingal, J.F. 1984. Rubiaceae. Flora of the Netherlands Antilles 3: 378-409.
• Howard, R.A. 1989. Dicotyledoneae - Part 3. In: Flora of the Lesser Antilles, Leeward and Windward Islands. 6: 658. Arnold Arboretum, Harvard University, Jamaica Plain, Massachusetts.
• Mori, S.A., Gracie, C.A. 2007. Flowering Plants. Plants and Lichens of Saba Virtual Herbarium of The New York Botanical Garden. [link]
• Rojer, A. 1997. Biological Inventory of Saba. 87 pp. CARMABI Foundation, Curaçao.
• The Plant List 2013. The Plant List version 1.1. [link]
• WCSP 2017. World Checklist of Selected Plant Families. Facilitated by the Royal Botanic Gardens, Kew. [link]

Literature references linked to higher taxa

• Encyclopedia of Life. [link] (Rubiaceae)