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Lua i Stíl Chicago (17ú heag.)SanJose, S., E. Roman, agus V. Beral. Low Birthweight and Preterm Delivery, Scotland, 1981-84: Effect of Parents' Occupation. 1992.
Lua MLA (9ú heag.)SanJose, S., et al. Low Birthweight and Preterm Delivery, Scotland, 1981-84: Effect of Parents' Occupation. 1992.
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