Norman, D. W. (1973). Economic analysis of agricultural production and labour utilisation among the Hausa in the North of Nigeria. Dept. of Agricultural Economics.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNorman, D. W. Economic Analysis of Agricultural Production and Labour Utilisation Among the Hausa in the North of Nigeria. [East Lansing: Dept. of Agricultural Economics, 1973.
एमएलए (9वां संस्करण) प्रशस्ति पत्रNorman, D. W. Economic Analysis of Agricultural Production and Labour Utilisation Among the Hausa in the North of Nigeria. Dept. of Agricultural Economics, 1973.
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