1. Aoba, T. 1964. Studies on bulb formation and dormancy in the onion. VIII. The effect of the length of short-day period before bulbing and the length of long-day period before harvest on bulb formation and sprouting of planted bulbs. J. Japan. Soc. Hort. Sci. (Japan) 33: 46–52 (In Japanese with English abstract).
2. Boyhan, G. E., R. L. Torrance, J. Cook, C. Riner and C. R. Hill. 2009. Sowing date, transplanting date, and variety effect on transplanted short-day onion production. Horttechnology 19: 66–71.
3. Brewster, J. L. 1982. Growth, dry matter partition and radiation interception in an overwintered bulb onion (Allium cepa L.) crop. Ann. Bot. 49: 609–617.
4. Brewster, J. L. 2008. Physiology of crop growth, development and yield. p. 123–135. In: J. L. Brewster (eds.). Crop Production Science in Horticulture. Vol. 15. Onions and other vegetable alliums 2nd edition. CABI, Wallingford, Oxfordshire, UK.
5. Brewster, J. L., F. M. Mondal and G. E. L. Morris. 1986. Bulb development in onion (Allium cepa L.) IV. Influence on yield of radiation interception, its efficiency of conversion, the duration of growth and dry-matter partitioning. Ann. Bot. 58: 221–233.