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Lua i Stíl Chicago (17ú heag.)Third International Mathematics and Science Study (TIMSS). International Association for the Evaluation of Educational Achievement agus Ina V.S Mullis. Mathematics and Science Achievement in the Final Year of Secondary School: IEA's Third International Mathematics and Science Study (TIMMS). Chestnut Hill, MA: TIMSS International Study Center, Boston College, 1998.
Lua MLA (9ú heag.)Third International Mathematics and Science Study (TIMSS). International Association for the Evaluation of Educational Achievement agus Ina V.S Mullis. Mathematics and Science Achievement in the Final Year of Secondary School: IEA's Third International Mathematics and Science Study (TIMMS). TIMSS International Study Center, Boston College, 1998.