Wardle, P. (1971). Operational research managerial economics of forestry: Proceedings of a meeting of a working group of the International Union of Forest Research Organisations held at the Forestry Commission Research Station, Alice Holt Lodge in September 1970. Her Majestys Stationery Office.

Wardle, P.A. Operational Research Managerial Economics of Forestry: Proceedings of a Meeting of a Working Group of the International Union of Forest Research Organisations Held at the Forestry Commission Research Station, Alice Holt Lodge in September 1970. London: Her Majestys Stationery Office, 1971.

Wardle, P.A. Operational Research Managerial Economics of Forestry: Proceedings of a Meeting of a Working Group of the International Union of Forest Research Organisations Held at the Forestry Commission Research Station, Alice Holt Lodge in September 1970. Her Majestys Stationery Office, 1971.