Labriola, A. (1908). Essays on the materialistic conception of history. C.H. Kerr & Company.
Lua i Stíl Chicago (17ú heag.)Labriola, Antonio. Essays on the Materialistic Conception of History. Chicago: C.H. Kerr & Company, 1908.
Lua MLA (9ú heag.)Labriola, Antonio. Essays on the Materialistic Conception of History. C.H. Kerr & Company, 1908.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.