1. Calvin, M., C. Heidelberger, J. C. Reid, B. M. Tolbert and P. F. Yankwich: “Isotopic Carbon”. J. Wiley & Sons Inc. 1949.
2. Cook, G. B., and I. F. Duncan: “Modern Radiochemical Practice ”. Oxford: Clarendon Press 1953.
3. Friedlander, G., and J. W. Kennedy: “Introduction to Radiochemistry”. J. Wiley & Sons Inc., 1949.
4. Hevesy, G.: “Radioactive Indicators”. New York: Interscience Publishers 1948.
5. Kamen: M. D., “Radioactive Tracers in Biology”. 2nd Ed. New York: Acad. Press 1951.