TIMSS 2019 international results in mathematics and science
Mullis, Ina V. S., Michael O. Martin, Pierre Foy, Dana L. Kelly, and Bethany Fishbein. “TIMSS 2019 international results in mathematics and science”, Chestnut Hill, Mass.: TIMSS & PIRLS International Study Center, 2020. http://hdl.handle.net/2345/bc-ir:109272.