Methods and Procedures:
PIRLS 2021 Technical Report
Chapter 12: Examining Country-Level Differences Between digitalPIRLS Data and Bridge Data
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Matthias von Davier, Ina V.S. Mullis, Bethany Fishbein, and Pierre Foy, Editors
Liqun Yin, Bethany Fishbein, Ummugul Bezirhan, Pierre Foy, and Matthias von Davier
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