United States. Department of Commerce and United States. Bureau of Economic Analysis. "Preliminary and Revised Second Quarter 1965 and Historical Data," The National Income and Product Account (1965-08-01). https://fraser.stlouisfed.org/title/52/item/57013, accessed on February 17, 2020.
Preliminary Data for Q2.1965, Revised Q2.1962 to Q2.1965, and Historical Revisions back to 1961