1. Lawrence, H. S. Cellular Immunity. In: Clinical Immunobiology, Vol. 1, p. 54. Ed.: F. H. Bach, R. A. Good, Academic Press, New York 1972.
2. Burnet, F. M. The clonal selection theory of acquired immunity. Cambridge University Press, London 1959.
3. Burnet, F. M. Cellular Immunology, pp. 255–285, 591 to 627. Cambridge University Press, London 1971.
4. Allison, A. C. Unresponsiveness to self antigens. Lancet (1971/II) 1401.
5. Weigle, W. O. Recent observations and concepts in immunological unresponsiveness and autoimmunity. Clin. Exp. Immunol. 9 (1971) 437.