1. Sustainable Agriculture—Green Manure in Rice Farming;Abrol,1988
2. Alam, M. M. 1989. Stability and comparative nitrogen contribution of pre-rice legumes: Grain legumes vs green manure. M. S. Thesis, Univ. of the Philippines at Los Baños, Los Baños, Laguna.
3. Aeschynomene as green manure for rice
4. Alberto, M. C. R. 1989., Sesbania rostrata as a green manure for rice in different adverse soils of the Philippines. M. S. Thesis, Univ. of the Philippines at Los Baños, Laguna.