Preprimary enrollment.
APA Citation
United States. Office of Educational Research and Improvement. Center for Education Statistics., National Center for Education Statistics., National Center for Educational Statistics. Preprimary enrollment. [Washington]: U.S. Dept. of Health, Education, and Welfare, Education Division, National Center for Educational Statistics.
MLA Citation
United States. Office of Educational Research and Improvement. Center for Education Statistics, National Center for Education Statistics, and National Center for Educational Statistics. Preprimary Enrollment. [Washington]: U.S. Dept. of Health, Education, and Welfare, Education Division, National Center for Educational Statistics,
Warning: These citations may not always be complete (especially for serials).