Dillman, Don A.
Mail and telephone surveys: the total design method - New York A Wiley-interscience pub. 1978 - xvi, 325 p.
471215554
Social surveys
301.15 / DIL
Mail and telephone surveys: the total design method - New York A Wiley-interscience pub. 1978 - xvi, 325 p.
471215554
Social surveys
301.15 / DIL