Costa, H. L. The background of nationalism and other essays. Solidaridad publishing house.
Lua i Stíl Chicago (17ú heag.)Costa, H.De La. The Background of Nationalism and Other Essays. Solidaridad publishing house.
Lua MLA (8ú heag.)Costa, H.De La. The Background of Nationalism and Other Essays. Solidaridad publishing house.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.