These quotations are from Madame Wu's first-hand account of her experimental determination of parity violation which was given to the International Conference on the History of Original Ideas and Basic Discoveries, held in Erice, Sicily, July 27-August 4, 1994; vide:

History of Original Ideas and Basic Discoveries in Particle Physics, edited by H. B. Newman and T. Ypsilantis, Plenum Press, N.Y. 1996, pp 390-391.