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Bridson, D.M. & Verdcourt, B. (2003). Rubiaceae, Part 3 Flora Zambesiaca 5(3) Pages 527 - 529. As Polysphaeria lanceolata lanceolata pedata
Burrows, J.E., Burrows, S.M., Lötter, M.C. & Schmidt, E. (2018). Trees and Shrubs Mozambique Publishing Print Matters (Pty), Cape Town. Page 972.
Timberlake, J.R., Bayliss, J., Dowsett-Lemaire, F., Congdon, C., Branch, B., Collins, S., Curran, M., Dowsett, R,J., Fishpool, L., Francisco, J., Harris, Kopp, M. & de Sousa, C. (2012). Mt Mabu, Mozambique: Biodiversity and Conservation Report produced under the Darwin Initiative Award 15/036. Royal Botanic Gardens, Kew, London Page 75.
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