Horn, K. (1967). Long-term Planning. The Institute of National Planning.
芝加哥风格引文Horn, Karl-Heinz. Long-term Planning. Cairo: The Institute of National Planning, 1967.
MLA引文Horn, Karl-Heinz. Long-term Planning. The Institute of National Planning, 1967.
警告：这些引文格式不一定是100％准确.