APA aipamena

(2006). Problem Solving in the PISA & TIMSS 2003 Assessments. U.S. Department of Education.

Chicago Style aipamena

Problem Solving in the PISA & TIMSS 2003 Assessments. U.S. Department of Education, 2006.

MLA aipamena

Problem Solving in the PISA & TIMSS 2003 Assessments. U.S. Department of Education, 2006.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.