Harper,J.L. 1977. Population Biology of Plants. Academic Press, London.
Jinks,R.L., Willoughby,I., and Baker,C. 2005. Direct seeding of ash (Fraxinus excelsior L.) and sycamore (Acer pseudoplatanus L.): the effects of sowing date, site conditions and pre-emergent herbicides on seedling emergence and survival. Forest Ecology and Management. In review.
Kollmann,J., Coomes,D.A., and White,S.M. 1998. Consistencies in post-dispersal seed predation of temperate fleshy- fruited species among seasons, years and sites. Functional Ecology 12: 683-690.
Willoughby,I., Jinks,R., Gosling,P., and Kerr,G. 2004. Creating new broadleaved woodlands by direct seeding (PDF-647K). Forestry Commission, Edinburgh.