@techreport{U.S. Department of Health and Human Services1988,
author = {U.S. Department of Health and Human Services, National Center for Health Statistics },
year = {1988},
URL = {http://www.cdc.gov/nchs/nsfg/nsfg_cycle4.htm},
publisher = {National Survey of Family Growth, Cycle IV, 1988. U.S. Department of Health and Human Services, National Center for Health Statistics },
}