Heger, W. (1982). Cardiologia.
Lua i Stíl Chicago (17ú heag.)Heger, W. Cardiologia. 1982.
Lua MLA (9ú heag.)Heger, W. Cardiologia. 1982.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.
Lua APA (7ú heag.)