References
- Davies, O. L. Statistical Methods in Research and Production (Second Edition). Oliver and Boyd, London, 1949.
- Russell, E. J. Soil Conditions and Plant Growth (Eighth Edition). Longmans, London, 1950, p. 332.
- Tippett, L. H. C. Methods of Statistics (Fourth Edition). Williams and Norgate, London, 1952, p. 95.
- Davies, O. L. Design and Analysis of Industrial Experiments (First Edition). Oliver and Boyd, London, 1954, Table E.l.