Rannsóknir
Asking Questions: The Definitive Guide to Questionnaire Design -- For Market Research, Political Polls, and Social and Health Questionnaires
eftir Norman M. Bradburn; Seymour Sudman; Brian Wansink
frá kr. 6,080
eftir Norman M. Bradburn; Seymour Sudman; Brian Wansink
frá kr. 6,080