Clarke de Armando, R. (1965). English for Commercial Schools (7a.ed.). Angel Estrada.
Lua i Stíl Chicago (17ú heag.)Clarke de Armando, Rosa. English for Commercial Schools. 7a.ed. Buenos Aires: Angel Estrada, 1965.
Lua MLA (9ú heag.)Clarke de Armando, Rosa. English for Commercial Schools. 7a.ed. Angel Estrada, 1965.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.