Listhaug, Ola. “Norman M. Bradburn & Seymour Sudman: Polls and Surveys. Understanding What They Tell Us. San Francisco: Jossey-Bass, 1988, 249 Pp”. Scandinavian Political Studies 1 (January 1, 1990). Accessed December 6, 2025. https://tidsskrift.dk/scandinavian_political_studies/article/view/32673.