U.S. Bureau of Labor Statistics. (1941). Retail prices of food. U.S. Govt. Print. Off.
Lua i Stíl Chicago (17ú heag.)U.S. Bureau of Labor Statistics. Retail Prices of Food. Washington, D.C: U.S. Govt. Print. Off, 1941.
Lua MLA (9ú heag.)U.S. Bureau of Labor Statistics. Retail Prices of Food. U.S. Govt. Print. Off, 1941.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.