• Champagnat, P. (1954). The Pruning of Fruit Trees (Edited and translated from the French by N. B.Bagenal). Crosby-Lockwood, London .
  • Cormack, E. & Gimingham, C. H. (1964). Litter production by Calluna vulgaris (L) Hull. J. Ecol., 52, 285.
  • Garrison, G. A. (1953). Effects of clipping on some range shrubs. J. Range Mgmt, 6, 309.
  • Gimingham, C. H. (1949). The effects of grazing on the balance between Erica cinerea (L) and Calluna vulgaris (L) Hull in upland heaths and their morphological responses. J. Ecol., 37, 100.
  • Greve, E. W. (193839). A comparison of pruned and unpruned trees during the first ten years in the apple orchard. Trans. Peninsula hort. Soc., 45.
  • Kenworthy, J. B. (1964). Study of the changes in plant and soil nutrients associated with moorburning and grazing. Unpublished thesis, University of St. Andrews.
  • Knight, R. C. (1930). Some effects of pruning ‘leaders” and of the absence of laterals on the rate of growth of stems of apple and plum. J. Pomol., 8, 93.
  • Linton, A. (1918). The Grazing of Hill Pastures. Lewis, Selkirk .
  • Metcalfe, G. (1950). The ecology of the Cairngorms. Part II The mountain Callunetum. J. Ecol., 38, 46.
  • Schilleter, J. C. & Richey, H. W. (1940). Textbook of General Horticulture. Chapter: Pruning Horticultural Plants. McGraw-Hill, New York .
  • Thomas, B. (1935). The composition and feeding value of some moorland plants. Agric. Prog., 12, 82.
  • Thomas, B. (1956). Heather (Calluna vulgaris) as a food for livestock. Herb. Abstr., 26, 1.
  • Watt, A. S. (1947). Pattern and process in the plant community. J. Ecol., 35, 1.