Cunningham, F. G., MacDonald, P. C., Gant, N. F., Leveno, K. J., & Gilstrap III, L. C. (1996). Obstetricia de Williams.
Lua i Stíl Chicago (17ú heag.)Cunningham, F. Gary, Paul C. MacDonald, Norman F. Gant, Kenneth J. Leveno, agus Larry C. Gilstrap III. Obstetricia De Williams. 1996.
Lua MLA (9ú heag.)Cunningham, F. Gary, et al. Obstetricia De Williams. 1996.
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