National Assessment of Educational Progress (Project) & National Center for Education Statistics. (1978). Mathematics objectives: Second assessment. The Assessment.
Chicago-Zitierstil (17. Ausg.)National Assessment of Educational Progress (Project) und National Center for Education Statistics. Mathematics Objectives: Second Assessment. Denver: The Assessment, 1978.
MLA-Zitierstil (9. Ausg.)National Assessment of Educational Progress (Project) und National Center for Education Statistics. Mathematics Objectives: Second Assessment. The Assessment, 1978.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.