Cole-Lewis, Heather J., Trace S. Kershaw, Valerie A. Earnshaw, Kimberly Ann Yonkers, Haiqun Lin, and Jeannette R. Ickovics. "Pregnancy-Specific Stress, Preterm Birth, and Gestational Age Among High-Risk Young Women." Health psychology : official journal of the Division of Health Psychology, American Psychological Association (2014).