1. 1) Dinsmoor, J. A., Browne, M. P. and Lawrence, C. E.: A test of negative discriminative stimulus as a rein forcer of observing, Journal of Experimental Analysis of Behavior, 18, pp. 79-85, 1972.
2. 2) Shultz, T. W.: Agriculture in Unstable Economy, NY, McGraw Hill, 1945.
3. 3) Robinson, J.: Essay in The Theory of Employment, Basil Blackwell, 1947. 篠原三代平, 伊藤善市共訳.: 雇用理論研究, 東洋経済新報社, 1955.
4. 4) Hicks, J. R.: The Theory of Wage, London, Macmillan, 1932, 内田忠寿訳: 賃金の理論, 東洋経済新報社, 1963
5. 5) 梅村又次: 賃金, 雇用, 農業, 大明堂, 1961.