Elias T. Ayuk, Bahiru Duguma, Steve Franzel, Joseph Kengue, Matthias Mollet, Theophile Tiki-Manga and Pauline Zenkeng. 1999. “USES, MANAGEMENT AND ECONOMIC POTENTIAL OF GARCINIA KOLA AND <em>RICINODENDRON</em> <em>HEUDELOTII</Em> IN THE HUMID LOWLANDS OF CAMEROON”. Journal of Tropical Forest Science (JTFS) 11 (4):746-61. https://jtfs.frim.gov.my/jtfs/article/view/1545.