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La méthode de recherches sur les systèmes d'exploitation agricole : son applicabilité au petit exploitant / par David W. Norman.
- Michigan state university. Department of agricultural economics,
- 1980.
- East Lansing, MI :
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Les recherches sur les systèmes d'exploitation agricole : une evaluation critique / par E.H. Gilbert, D.W. Norman, F.E. Winch.
- Michigan state university. Department of agricultural economics,
- 1980.
- East Lansing, MI :
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Economic analysis of agricultural production and labour utilization among the Hausa in the North of Nigeria / by D.W. Norman.
- 86
- Michigan state university. Department of agricultural economics,
- 1973.
- East Lansing, MI :
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Methodology and problems of farm management investigations : experiences from Northern Nigeria / by D.W. Norman.
- 862.9
- Michigan state university. Department of agricultural economics,
- 1973.
- East Lansing, MI :