"Archived copy"(PDF). www.bea.gov. Archived from the original(PDF) on 14 October 2011. Retrieved 13 January 2022.{{cite web}}: CS1 maint: archived copy as title (link)
"Archived copy"(PDF). www.bea.gov. Archived from the original(PDF) on 14 October 2011. Retrieved 13 January 2022.{{cite web}}: CS1 maint: archived copy as title (link)