APA-referens (7:e uppl.)

National Assessment of Educational Progress (Project). (1979). Changes in mathematical achievement, 1973-78: Results from the second assessment of mathematics. NEAP.

Chicago-referens (17:e uppl.)

National Assessment of Educational Progress (Project). Changes in Mathematical Achievement, 1973-78: Results from the Second Assessment of Mathematics. Denver: NEAP, 1979.

MLA-referens (9:e uppl.)

National Assessment of Educational Progress (Project). Changes in Mathematical Achievement, 1973-78: Results from the Second Assessment of Mathematics. NEAP, 1979.

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