1. Forestry Commission: Rate of Growth of Conifers in Great Britain, Bulletin No. 3, London 1920.
2. Forestry Commission: Growth and Yield of Conifers in Great Britain, Bulletin No. 10, London 1928, wieder aufgelegt 1930 und 1946.
3. Forestry Commission: Revised Yield Tables for Conifers in Great Britain, byF. C. Hummel andJ. Christie, Forest Record No. 24, 1953.
4. Gehrhardt, E.: British Yield Tables, Allg. Forst- und Jagdzeitung 1926, S. 142.
5. Forestry Commission: Revised Yield Tables for Japanese Larch in Great Britain, byF. C. Hummel. Forest Record No. 1, 1949.