Sy, G. S. (2012). Treating asthma in elderly people. IN Life extension [column]. Manila Bulletin.
Lua i Stíl Chicago (17ú heag.)Sy, Gary S. "Treating Asthma in Elderly People. IN Life Extension [column]." Manila Bulletin 2012.
Lua MLA (9ú heag.)Sy, Gary S. "Treating Asthma in Elderly People. IN Life Extension [column]." Manila Bulletin, 2012.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.