Não informado. (1918). Monthly Labor Review. Department of Labour, Bureau of Labor Statistics.
Lua i Stíl Chicago (17ú heag.)Não informado. Monthly Labor Review. Washington: Department of Labour, Bureau of Labor Statistics, 1918.
Lua MLA (8ú heag.)Não informado. Monthly Labor Review. Department of Labour, Bureau of Labor Statistics, 1918.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.