Savill, P. (1988). National hardwoods programme: Report of the eighth meeting and second meeting of the Uneven-aged Silviculture Group 7 January 1988. Oxford Forestry Institute, University of Oxford.
Lua i Stíl Chicago (17ú heag.)Savill, P. National Hardwoods Programme: Report of the Eighth Meeting and Second Meeting of the Uneven-aged Silviculture Group 7 January 1988. Oxford Forestry Institute, University of Oxford, 1988.
Lua MLA (9ú heag.)Savill, P. National Hardwoods Programme: Report of the Eighth Meeting and Second Meeting of the Uneven-aged Silviculture Group 7 January 1988. Oxford Forestry Institute, University of Oxford, 1988.
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