Smith, G. (1907). Labour and capital: A letter to a labour friend. The Macmillan company.
Lua i Stíl Chicago (17ú heag.)Smith, Goldwin. Labour and Capital: A Letter to a Labour Friend. New York, London: The Macmillan company, 1907.
Lua MLA (8ú heag.)Smith, Goldwin. Labour and Capital: A Letter to a Labour Friend. The Macmillan company, 1907.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.