Lagemann, J. (1977). Traditional African farming systems in eastern Nigeria: An analysis of reaction to increasing population pressure. Weltforum Verlag.
芝加哥风格引文Lagemann, Johannes. Traditional African Farming Systems in Eastern Nigeria: An Analysis of Reaction to Increasing Population Pressure. Munchen: Weltforum Verlag, 1977.
MLA引文Lagemann, Johannes. Traditional African Farming Systems in Eastern Nigeria: An Analysis of Reaction to Increasing Population Pressure. Weltforum Verlag, 1977.
警告：这些引文格式不一定是100％准确.