Hughes, D. A., & Norton, R. (2009). Vitamin D and respiratory health.
Lua i Stíl Chicago (17ú heag.)Hughes, David A., agus Rosemary Norton. Vitamin D and Respiratory Health. 2009.
Lua MLA (9ú heag.)Hughes, David A., agus Rosemary Norton. Vitamin D and Respiratory Health. 2009.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.