Kotlińska, Janina, Jarosław Kuśpit, Zdzisław A. Błasiak, and Grzegorz Kotliński. 2025. “Sources and Methods of Gathering Economic Information by Household Members”. Journal for Perspectives of Economic Political and Social Integration 31 (1):155-87. https://doi.org/10.18290/pepsi-2025-0006.