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Manu, A and Bationo, A and Geiger , S C (1991) Fertility status of selected millet producing soils of West Africa with emphasis on phosphorus. Soil Science, 152 (5). pp. 315-320. ISSN 0038-075X
Verma, D P and Singh, K D (1991) Changes in the nutrient status of soil caused by cropping and fertilization in a Typic Ustochrept. Fertilizer Research, 29. pp. 267-274. ISSN 0167-1731
Singh, R P and Desai , G M (1991) Farmer's fertilizer practices in the semi-arid tropics of India. Monograph. International Crops Research Institute for the Semi-Arid Tropics , Patancheru, Andhra Pradesh,India.
Burford, J R (1991) Requirements for Future ICRISAT Research on the Phosphorus Nutrition of Legumes. In: International workshop on Phosphorus Nutrition of Grain Legumes in the Semi-Arid Tropics, 8-11 Jan 1990, ICRISAT Patancheru, India.