PIRLS 2011 User Guide for the International Database. Supplement 4: PIRLS 2011 Sampling Stratification Information

Foy, P., & Drucker, K. T. (Eds.). (2013). PIRLS 2011 User Guide for the International Database. Supplement 4: PIRLS 2011 Sampling Stratification Information. Amsterdam, The Netherlands: International Association for the Evaluation of Educational Achievement.