1. , . 1997. Leaf litter of some native trees in Northeast Thailand: their decomposition and derived soil organic matter characteristics. In Proceedings of the International Conference on Tropical Forestry in the 21st Century. Vol. 2. Global changes in the tropical contexts. Faculty of Forestry, Kasetsart University, Bangkok, Thailand. 25–28.
2. 1979. Mineralization of organic nitrogen in paddy soils. In Nitrogen and Rice. IRRI: Los Banos, Philippines; 105–118.
3. Nitrogen mineralization from leaves and litter of tropical plants: Relationship to nitrogen, lignin and soluble polyphenol concentrations
4. 1997. On-farm assessment of sesbania green manure in a rainfed rice system in Northeast Thailand. Ph.D. dissertation, University of Hawaii at Manoa: Hololulu, Hawaii; 184.
5. 1988. The agronomic and soil fertility effects of leguminous ley pastures in sandy, upland soils of Northeast Thailand. Ph.D. dissertation, University of Queensland, 266 p.