Williams, S. J. (1995). Essentials of health services. Delmar.
Lua i Stíl Chicago (17ú heag.)Williams, Stephen J. Essentials of Health Services. Albany, N.Y: Delmar, 1995.
Lua MLA (9ú heag.)Williams, Stephen J. Essentials of Health Services. Delmar, 1995.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.