Nonsampling Error in Surveys Autor Judith T Lessler et al. 4 aug 1992 Hardback Preț: 1480.07 lei 1626.45 lei 6-8 săpt. -9%
Methods for Testing and Evaluating Survey Questionnaires Autor Stanley Presser et al. 23 iun 2004 Paperback Preț: 656.72 lei 713.83 lei 6-8 săpt. -8%