1. Abdul-Baki, A. A. and Baker, J. D. (1973). Are changes in cellular organelles or membranes related to vigour loss in seeds. Seed Sci. & Technology, 1: 89-125.
2. Allen, G. S. (1958). Factors affecting the viability and germination behaviour of coniferous seed maturity Tsuga heterophylla (Rafn.) Sarg. For. Chronicles, 34: 266-274. https://doi.org/10.5558/tfc34266-3
3. Bewley, J. D. and Black, M. (1985). Seeds: Physiology of Development and Germination. pp. 367, Plenum Press, New York https://doi.org/10.1007/978-1-4615-1747-4
4. Bedell, P. E. (1989). Preliminary observations on variability of Teak in India. Indian Forester, 115: 72-81.
5. Bedell, P.E. (1998). Seed Science and Technology: Indian Forestry Species. pp 346, Allied Publishers, New Delhi.
6. Ching, T. M. (1960). Seed production from individual cones of grand fir (Abies grandis Lindl). Jour. of For., 58: 959-961.
7. Cram, W. H., and Worden, H. A. (1957). Maturity of white spruce cones and seed. For. Sci., 3:263-269.
8. Czabator, F. J. (1962). Germination value: an index combining speed and completeness of Pine seed germination. For. Sci., 8: 386-396.
9. Edwards, D. G. W. (1980). Maturity and quality of tree seeds: a state-of-the-art review. Seed Sci. and Techno., 8: 625-657.
10. Ellis, R. H. Hong, T. D. and Roberts, E. H. (1987). Comparison of cumulative germination and rate of germination of dormant and aged barley seed lots at different constant temperatures. Seed Sci. and Techno., 15: 717-725.
11. Ford-Robertson, F. C. (1971). Terminology of Forest Science and Products. Multilingual Forestry Terminology Series No.1. Society of Amer. For. Washington, D. C.
12. Fowells, H. D. (1949). An index of ripeness for sugar pine seed. US Forest Service, California. For. and Range Experi. Station Res. Notes, 64: 1-5.
13. Harrington, J. F. (1972). Seed storage and longevity. In: Seed Biology (ed. T. Kozlowski), pp. 145-245, Academic Press, New York. https://doi.org/10.1016/B978-0-12-395605-7.50009-0
14. Heit, C. E. (1961). Abnormal germination during laboratory testing in coniferous tree seed. Proc. ISTA, 26: 419-927.
15. ISTA (1985). International Rules for Seed Testing. Rules and Annexure. International seed Testing Association. Seed Science & Technology, 4: 3-177.
16. Jacqueline, A., Selvaraj and Ramaswamy, K. R. (1984). Studies on pod and seed maturation in Daincha (Sesbania aculeata Poirs). Seed Res., 12(1): 19-23.
17. Khera, N and Saxena, A. K. (2008). Effect of presowing treatments on germination and seedling growth of Tectona grandis. Indian Jour. of For., 31(2): 181-186.
18. Krugman, S. L. (1966). Artificial ripening of sugar pine seeds. U. S. For. Service Res. Paper. PSW, 32: 1-7.
19. Mahadevan, N. P. (1991). Phenological observations of some forest tree species as an aid to seed collection. Jour. of Tropi. For., 7(3): 243-247.
20. Maki, T. E. (1940). Significance and applicability of seed maturity indices for ponderosa pine. Jour. of For., 38: 55-60.
21. Manohar, M. S. and Sachen, S. C. P. (1974). Pod development and germination studies on Pea (Pisum sativum). Vegetable Sci., 1: 22-30.
22. Matyas, V. C. (1972). Möglichkeiten der Fruhernte in Weisskiefer- Samenplantagen. (The possibility of early harvesting in Scots pine seed orchards.) Silvae Genetica, 21:191-193.
23. Pandit, A., Pant, K., and Jeet Ram (2004). Effect of collection date on capsule moisture content and germination of Populus ciliata Wall. ex Royle from central Himalaya. New Forests, 23(2): 121-130. https://doi.org/10.1023/A:1015694310479
24. Pogoda, G. (1962). The influence of harvesting time on the germinability of Douglas fir seed. Allgemeine Forstzeitschrift 17:283. (Forestry Abstracts, 23:5061.)
25. Rediske, J. H. and Nicholson, D. C. (1965). Maturation of noble fir seed - a biochemical study. Weyerhaeuser Forestry Paper, 2: 1-15.
26. Rediske, J. H. (1969). Effect of cone picking date on Douglas fir seed quality. For. Sci., 15: 404-410.
27. Schmidt, L. (2000). Guide to Handling of Tropical and Sub-tropical Forest Seed. ISBN 87-982428-6-5, DANIDA Forest Seed Center.
28. Sharma, D. P., Bhardwaj, S. D. and Natiyal, R. K. (1996). Effect of seed collection time and tree vigour on germination and growth of Acacia catechu Willd seedlings. Range Manag. and Agroforestry, 17(1): 75-80.
29. Singh, V. and Sah, V.K. (1994). Effect of collection date on germination and seedling growth in West Himalayan Banj Oak (Quercus leucotrichophora A. Camus). Van Vigyan, 32(4): 75-79.
30. Singh, V., Singh, O., and Sharma, H. P. (1986). Germination of Silver fir (Abies pindrow) seed as affected by moisture stress. Indian Jour. of For., 9: 293-295.
31. Troup, R. S. (1986). The Silviculture of Indian Trees. Vol. II, pp 783, International Book Distributors, Dehra Dun
32. Varnell, R. J. Squillace, A. E. and Bengtoson, G. W. (1967). Variation and heritibility of fruitfulness in Slash pine. Silva Genetica, 16: 125-128.
33. Willan, R. L. (1985). In A guide to forest seed handling with special reference to the tropics. FAO Forestry Paper, FAO, Rome, 20/2.