1. Baranski, M., 1975. An analysis of variation within white oak (Quercus alba L.). North Carolina Agriculture Experimental Station Technical Bulletin No. 236.
2. Quaternary refugia of north European trees;Bennett;J. Biogeogr.,1991
3. Holocene isochrone maps and patterns of tree-spreading in the British Isles;Birks;J. Biogeogr.,1989
4. Positional and seasonal variation in oak (Quercus; Fagaceae) leaf morphology;Blue;Am. J. Bot.,1988
5. Bohan, R., 1997. The historical ecology of the woodlands of Ireland, Western Scotland and the Isle of Man. Ph.D. Thesis. University of Dublin, Trinity College, Dublin, Ireland, 317 pp.