Bradburn, Norman M. Asking questions : the definitive guide to questionnaire design - for market research, political polls, and social and health questionnaires / Norman M. Bradburn, Seymour Sudman, Brian Wansick - Rev. ed. - Jossey-Bass 2004 25772 ISBN: 9780787970888 Subjects--Topical Terms: Social sciences - ResearchQuestionnaires LC Class. No.: H / 62