LaRoche, S., & Foy, P. (2017). Sample Implementation in PIRLS 2016. In M. O. Martin, I. V. S. Mullis, & M. Hooper (Eds.), Methods and Procedures in PIRLS 2016 (pp. 5.1-5.126). Retrieved from Boston College, ÷ÈÓ°Ö±²¥; PIRLS International Study Center website: /publications/pirls/2016-methods/chapter-5.html