Tolin, D. F., Maltby, N., Weathers, F. W., Litz, B. T., Knight, J., & Keane, T. M. (2004). The use of the MMPI-2 infrequency-psychopathology scale in the assessment of posttraumatic stress disorder in male veterans. Journal of Psychopathology and Behavioral Assessment, 26(1), 23–29. http://www.wkap.nl/journalhome.htm/0882-2689