The three R's hold their own at the midcentury :
a summary of research studies.
APA Citation
National Education Association of the United States. Research Division. (1951). The three R's hold their own at the midcentury: a summary of research studies. Washington.
MLA Citation
National Education Association of the United States. Research Division. The Three R's Hold Their Own At the Midcentury: a Summary of Research Studies. Washington, 1951.
Warning: These citations may not always be complete (especially for serials).