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Koen, Nastassja, Kirsty Brittain, Kirsten A. Donald, Whitney Barnett, Sheri Koopowitz, Karen Maré, Heather J. Zar, και Dan J. Stein. "Psychological Trauma and Posttraumatic Stress Disorder: Risk Factors and Associations With Birth Outcomes in the Drakenstein Child Health Study." Eur J Psychotraumatol 2016.

Koen, Nastassja, et al. "Psychological Trauma and Posttraumatic Stress Disorder: Risk Factors and Associations With Birth Outcomes in the Drakenstein Child Health Study." Eur J Psychotraumatol 2016.