1. Ram, J. S., 1967. J. Gerontol. 22: 92.
2. Walford, R. L., 1969. The Immunologic Theory of Aging, Williams and Wilkins, Baltimore.
3. Walford, R. L., 1974. Fed. Proc., Fed. Am. Soc. Exp. Biol. 33: 2020–2027.
4. Walford, R. L., 1979. Mech Ageing Dev. 9: 19–26.
5. Makinodan, T. & Kay, M. M. B., 1980. Advances in Immunology Eds., H. Kunkel & F. Dixon, Vol. 29, Academic Press, New York, pp. 287–330.