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Johansone, I. & Wry, E. (2016). Quality Assurance Program for ÷ÈÓ°Ö±²¥ 2015. In M. O. Martin, I. V. S. Mullis, & M. Hooper (Eds.), Methods and Procedures in ÷ÈÓ°Ö±²¥ 2015 (pp. 9.1-9.14). Retrieved from Boston College, ÷ÈÓ°Ö±²¥; PIRLS International Study Center website: http://timss.bc.edu/publications/timss/2015-methods/chapter-9.html
Methods and Procedures in ÷ÈÓ°Ö±²¥ 2015
Michael O. Martin, Ina V.S. Mullis, and Martin Hooper, Editors
Ieva Johansone and Erin Wry