1. Personnel training and development;Campbell;Am Psychol Rev,1971
2. How we should measure “change” or should we?;Cronbach;Psychol Bull,1970
3. Experimental and quasi-experimental design for research and teaching;Campbell,1963
4. Quasi-experimental approaches to social science: perspectives and problems;Caporaso,1973
5. Science and behavior: an introduction to research methods;Neale,1973