TIMSS 2011 international results in mathematics
Mullis, Ina V. S., Michael O. Martin, Pierre Foy, and Alka Arora, eds. “TIMSS 2011 international results in mathematics”, Chestnut Hill, MA: IEA, TIMSS & PIRLS, International Study Center, Lynch School of Education, Boston College, 2012. http://hdl.handle.net/2345/bc-ir:104609.