Bald, W. Active Grammar.
Lua i Stíl Chicago (17ú heag.)Bald, W-D. Active Grammar. Hong Kong : Longman.
Lua MLA (8ú heag.)Bald, W-D. Active Grammar.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.
      Bald, W. Active Grammar.
Lua i Stíl Chicago (17ú heag.)Bald, W-D. Active Grammar. Hong Kong : Longman.
Lua MLA (8ú heag.)Bald, W-D. Active Grammar.