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.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.