Sheerin, S. Self-access (6a ed.).
Lua i Stíl Chicago (17ú heag.)Sheerin, Susan. Self-access. 6a ed.
Lua MLA (8ú heag.)Sheerin, Susan. Self-access. 6a ed.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.
Lua APA (7ú heag.)