- IPNI Life Sciences Identifier (LSID)
- The arborescent Rubiaceae of Malaya : a manual of trees of Malayan Rubiaceae, incorporating keys to all Malayan genere, general notes on ecology & utilisation, and a revision of all genera represented by arborescent species
- Family as entered in IPNI
See also Tree Fl. Malaya 4: 355. 1989.