Kerstis B., Engström G., Sundquist K., Widarsson M., and Rosenblad A. “The Association Between Perceived Relationship Discord at Childbirth and Parental Postpartum Depressive Symptoms: A Comparison of Mothers and Fathers in Sweden”. Upsala Journal of Medical Sciences, vol. 117, no. 4, May 2012, doi:10.3109/03009734.2012.684805.