Cunningham, F. G., MacDonald, P. C., & Gant, N. F. (1996). Obstetricia de Williams.
Lua i Stíl Chicago (17ú heag.)Cunningham, F. Gary, Paul C. MacDonald, agus Norman F. Gant. Obstetricia De Williams. 1996.
Lua MLA (9ú heag.)Cunningham, F. Gary, et al. Obstetricia De Williams. 1996.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.