1. Daily Telegraph, 5 (November 10, 1973).
2. Physics in your high school (American Institute of Physics, McGraw-Hill, New York, 1960).
3. Ahlgren, A., and Walberg, H. J., Nature, 245, 187–190 (1973).
4. Roszak, T., The making of a counterculture (Doubleday, New York, 1969).
5. Reitz, J., Science Educ., 57, 121–134 (1973).