1. Agricultural Statistics. 1882–1953. H.M.S.O.
2. Akdik, S, and Müntzing, A. 1949. New cases of segmental interchange and some other meio tic irregularities in rye. Hereditas, 35, 67–76.
3. Armstrong, J M, and White, W J. 1935. Factors influencing seed setting in alfalfa. J agric Sci, 25, 161–179.
4. Darlington, C D, and La Cour, L F. 1947. The Handling of Chromosomes. Allen and Unwin, London, pp. 180.
5. Darlington, C D, and Mather, K. 1949. The Elements of Genetics. Allen and Unwin, London, pp. 446.