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              Freeman, H. E., Rossi, P. H. & Lipsey, M. W. (1999). Evaluation: A systematic approach (6. Aufl.). Sage Publications.
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            - 
              Rossi, P. H., H. E. Freeman & M. W. Lipsey (1999), Evaluation. A Systematic Approach, Thousand Oaks et al.: Sage (6th ed.).
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            - 
              Rossi, P.H., Freeman, H.E. and Lipsey, M.W. (1999) Evaluation: A Systematic Approach, 6th edn. London: SAGE.
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            - 
              Rossi, P.H., Freeman, H.E. and Lipsey, M.W. (1999) Evaluation: a Systematic Approach, 6th edn. London: Sage.
                 (xsd:string)
              
            
 
            - 
              Rossi, Peter; Lipsey, M.W.; Freeman, H.E. (1999): Evaluation. A Systematic Approach. Thousand Oaks.
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