TIMSS 2019 user guide for the international database
Fishbein, Bethany, Pierre Foy, and Liqun Yin. “TIMSS 2019 user guide for the international database”, Chestnut Hill, Mass.: TIMSS & PIRLS International Study Center, Lynch School of Education and Human Development, Boston College, 2021. http://hdl.handle.net/2345/bc-ir:109292.