Lagemann, J. (1977). Traditional African farming systems in eastern Nigeria: An analysis of reaction to increasing population pressure. Weltforum Verlag.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रLagemann, Johannes. Traditional African Farming Systems in Eastern Nigeria: An Analysis of Reaction to Increasing Population Pressure. Munchen: Weltforum Verlag, 1977.
एमएलए (8वां संस्करण) प्रशस्ति पत्रLagemann, Johannes. Traditional African Farming Systems in Eastern Nigeria: An Analysis of Reaction to Increasing Population Pressure. Weltforum Verlag, 1977.
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