1. Akerman, A, and Mackey, J. 1948. The breeding of self-fertilised crops by crossing Svalof 1886–1946, 46–71 (Lund).
2. Bateman, A J. 1951. Controlled plant breeding. Science Progress, 154, 239–252.
3. Boyce, S W, Copp, L G, and Frankel, O H. 1947. The effects of selection for yield in wheat. Heredity, 1, 223–233.
4. Christian, C A, and Gray, S G. 1941. Interplant competition in mixed wheat populations and its relation to single plant selection. Journ of CSIR, 14, 59–68.
5. Copeland, F C. 1940. Growth rates in inbred and hybrid corn embryos. Collecting Net, 15, 169.