1. Duffie, J. A. and Beckman, W. A., Solar Engineering of Thermal Processes. John Wiley and Sons, New York, 1991.
2. Bengtsson, L. P. and Whitaker, J. H., Farm Structures in Tropical Climates. Food and Agriculture Organization of the United Nations, Rome, 1986.
3. Sodha, M. S., Bansal, N. K., Kumar, A., Bansal, P. K. and Malik, M. A. S., Solar Crop Drying, Vol. I and II. CPR Press, Boca Raton, Florida, FL.
4. Anon, Oman’s Renewable Energy Program (1996–2005). Sultan Qaboos University, Muscat, 1996.
5. UNESCO, World Solar Programme, 1996–2005. High Priority National Projects (World Plan of Action) United Nations’ Educational, Scientific and Cultural Organization, Paris, 1996.