U.S. Bureau of the Census. U.S. Census of Population: 1960. Subject Reports, Nonwhite Population by Race. Final Report PC(2)-1C. U.S. Government Printing Office, Washington, D.C. 1963.
The age classification is based on the age of the person in completed years as of April 1, 1960, as determined from the reply to a question on month and year of birth.