Amir Husni Mohd Shariff, Suhaimi Wan Chik, Adzmi Yaacob, and Mohd. Ghazali Hasan, “WHICH CANOPY TIER SHOULD BE SAMPLED TO DETERMINE THE FERTILITY (NUTRITIONAL) STATUS OF <em>ACACIA</em> <em>MANGIUM</em> ON BRIS SOILS?”, JTFS, vol. 6, no. 1, pp. 48–55, Sep. 1993.