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Joseph, K S., Kitaw Demissie, Robert W. Platt, Cande V. Ananth, Brian J. McCarthy, ja Michael S. Kramer. A Parsimonious Explanation for Intersecting Perinatal Mortality Curves: Understanding the Effects of Race and of Maternal Smoking. BioMed Central, 2004.

Joseph, K S., et al. A Parsimonious Explanation for Intersecting Perinatal Mortality Curves: Understanding the Effects of Race and of Maternal Smoking. BioMed Central, 2004.