1. : Fundamentals of Carbanion Chemistry. Academic Press, New York 1965, p. 159.
2. : Free Radicals. McGraw Hill, New York 1966, p. 127;
3. : Free Radicals. Wiley, New York 1973, Vol. 1, p. 113;
4. and : Free-radical Chemistry. Cambridge University Press 1974, p. 11.
5. and : Carbenes. Wiley, New York 1973, Vol. 1, p. 1;