APA
(1971). Intellectual development of children by demographic and socioeconomic factors: United States. Maryland: US Department of Health, Education, and Welfare.
Chicago
1971. Intellectual development of children by demographic and socioeconomic factors: United States. Maryland: US Department of Health, Education, and Welfare.
Harvard
(1971). Intellectual development of children by demographic and socioeconomic factors: United States. Maryland: US Department of Health, Education, and Welfare.
MLA
Intellectual development of children by demographic and socioeconomic factors: United States. Maryland: US Department of Health, Education, and Welfare. 1971.