Singer, E. (1998). Incentives for survey participation: Research on intended and unin- tended consequences. ZUMA-Arbeitsbericht, 42, 7-29.
(xsd:string)
Singer, E. (1998). Incentives for survey participation: Research on intended and unin- tended consequences. ZUMA-Arbeitsbericht, 42 pp. 7-29.
(xsd:string)