1. J. K. Ahn, B. S. Vergara, and G. F. Patena, 1988 : Grain filling in rice as affected by size and position of source and sink . Paper presented at IRRI Saturday Seminar on September 3, 1988. International Rice Research Institute, Philippines. 27 pp.
2. S. K. DeDatta, 1981 : Principles and practices of rice production . John Wiley & Sons, Inc., New York. 618 pp.
3. 10. Improving nitrogen fertilizer efficiency in lowland rice in tropical Asia
4. Influence of Plant Density and Nitrogen on Yield and Milling Quality of Lowland Rice in Nigeria