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  1. Experimental and quasi-experimental designs for research.Donald Thomas Campbell - 1966 - Chicago,: R. McNally. Edited by Julian C. Stanley & N. L. Gage.
  • First moral sense: Aspects of and contributors to a beginning morality in the second year of life.Sharon Lamb - 1991 - In William M. Kurtines & Jacob L. Gewirtz (eds.), Handbook of Moral Behavior and Development. L. Erlbaum. pp. 2--171.
     
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