1. The Guinness Book of Records. (1974). Ed. N. D. McWhirter and R. A. McWhirter, (London: Guinness Superlatives Ltd.)
2. Richardson, R. G. (1973). The Menopause—a Neglected Crisis. (Queensborough: Abbott Laboratories)
3. Doisy, E. A., Veler, C. D. and Thayer, S. A. (1930). The preparation of the crystalline ovarian hormone from the urine of pregnant women. J. Biol. Chem., 86, 499
4. Hunter, D. J. S., Nuffield Department of Obs. and Gynae., John Radcliffe Hospital, Oxford. Personal Communication
5. Ibid.