Paul Ekman and Wallace V. Friesen, Manual for the Facial Action Coding System (Palo Alto, CA: Consulting Psychologists Press, 1978).

Dante Cicchetti and Adrienne Banny, «A Developmental Psychopathology Perspective on Child Maltreatment», in Handbook of Developmental Psychopathology, eds. Michael Lewis and Karen D. Rudolph (New York: Springer, 2014), 723–741; Nikki Luke and Robin Banerjee, «Differentiated Associations Between Childhood Maltreatment Experiences and Social Understanding: A Meta-Analysis and Systematic Review», Developmental Review 33, no. 1 (2013): 1–28; Seth D. Pollak, «Mechanisms Linking Early Experience and the Emergence of Emotions: Illustrations from the Study of Maltreated Children», Current Directions in Psychological Science 17, no. 6 (2008): 370–375. See, for reviews, Willem E. Frankenhuis and Carolina de Weerth, «Does Early-Life Exposure to Stress Shape or Impair Cognition?», Current Directions in Psychological Science 22, no. 5(2013): 407–412.