1. 1. 1956 Census of Agriculture, Vol. 2, Dominion Bureau of Statistics.
2. 2. 1961 Census of Agriculture, Vol. 5, Dominion Bureau of Statistics.
3. Some Problems Encountered in Sampling from the Master Frame of Canadian Agriculture;Graham;Canadian Journal of Agricultural Economics,1964
4. 5. Koop, J. C. , Estimate of the Variance of a Ratio Based on Sampling One Primary Unit Per Stratum, unpublished memorandum, Dominion Bureau of Statistics, 1967.