1. Criteria for Solar Energy in Developing Countries;Tabor,1966
2. Use of Solar Energy for Solar Cooking;Lof,1963
3. Direct Use of the Sun's Energy;Daniels,1964
4. VITA Report No. 10. “Evaluation of Solar Cookers”. VITA 1204 Eastern Ave., Schnectady 8, New York.
5. Sun at Work;Shunan,1961