1Harrington JF. Drying,storage and packaging seeds to maintain germination and vigor, Proc 1959 short course for seedsman. USA: Mississipi State University, 1959.89-107.
2Assocition of offical Seed Analysis for testing seed. Pro. Assoc. Off. Seed Anal. 1965,54:50-56.
3Beattie,J. H,and V. R. Boswell.. Longevity of onion seed in relation to storage conditions. USA, US Department of Agr. Circ, 1939,5 : 12.
4Brwn E. Preserving the viability of Bermuda onion seed. Science, 1939,89 : 292-293.
5James E, Bass L N, Clark DC. Longevity of vegetable seeds stored 15- 20 years at Cheyenne, Wyoming. Proc Amer Soe for Horticul Sci, 1964, 84: 527-535.
6James E,Bass L N,Clark DC. varietal differences in longevity of vegetable seeds and their response to storage condition. Proc Amer Soc for Hortieul Sci, 1967,91:521-528.
7Kato T. Longevity of seeds ang storage. In.. Inoue Y (ed) Handbool of Vegetable Seed Production. Tokyo: Yokendo, 1967. 322-333.
8Lorenz OA, Maynard DN. Knott's Handbook for Vegetable Growers. New York:John wiley and Sons Inc, 1988. 388-390.
9Raymond AT George. Vegetable Seed Production Great Britain: Longman Growp: imited, 1989.80.
10Flavio F Rocha. Interaction of moisture content ang temperature on onion seed viability. Proc Amer Soc for Horticul Sci, 1958.73 : 385-389.
