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