Dyfyniad APA

National Assessment of Educational Progress (Project). (1979). Science objectives for the third assessment. NAEP.

Dyfyniad Arddull Chicago

National Assessment of Educational Progress (Project). Science Objectives for the Third Assessment. Denver, Colorado: NAEP, 1979.

Dyfyniad MLA

National Assessment of Educational Progress (Project). Science Objectives for the Third Assessment. NAEP, 1979.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.