BIBLIOGRAPHY
- Adler, R.—Photoperiodism. Hort. Abst., 9, 357.
- Imp. Bureaux of Hort. & Plantation Crops.—Effect of temperature and length of day on growth. Hort. Abst., 9, 330.
- Gregory, F. G.—Effect of length of day on the flowering of plants. Sei. Hort., 4.
- Purvis, O. N.—Vernalisation. Sci. Hort., 4.
- N.S.W. Agric. Gazette, 1st Feb., 43.—Effect of length of day and temperature on vegetables.
- Hill, A. G. G.—Vegetable seed growing in East Africa. E. Afric. Agr. Jour., 8(1), July, 1942.
- Imperial Agric. Bureaux.—Production of Seed of Root Crops and Vegetables. Joint Pubin., 5, July, 1943.
- Mercer, S. P.—Farm and Garden Seeds. Crosby Lockwood, London.
- Cox and Starr.—Seed Production and Marketing. Wiley, New York.