8. Kuhlman, K.R., Vargas, I., Geiss, E.G., & Lopez-Duran, N.L. (In Press). Age of trauma onset and HPA-axis dysregulation among trauma-exposed youth. Journal of Traumatic Stress.
7. Lopez-Duran, N.L., McGinnis, E., Kuhlman, K.R., Geiss, E.G., Vargas, I., & Mayer, S. (2015). HPA-axis stress reactivity in youth depression: Evidence of impaired regulatory processes in depressed boys. Stress, 1-9. doi:10.3109/10253890.2015.1053455
6. Kuhlman, K.R., Geiss, E.G., Vargas, I., & Lopez-Duran, N.L. (2015). Differential associations between childhood trauma subtypes and adolescent HPA-axis functioning. Psychoneuroendocrinology, 54(1), 103-114. doi:10.1016/j.psyneuen.2015.01.020
5. Vargas, I., Friedman, N.P., & Drake, C.L. (2015). Vulnerability to Stress-Related Sleep Disturbance and Insomnia: Investigating the Link with Comorbid Depressive Symptoms. Translational Issues in Psychological Sciences, 1(1), 57-66. doi:10.1037/tps0000015
4. Simoncic T.E., Kuhlman K.R., Vargas, I., Houchins S.C., & Lopez-Duran N. (2014). Facebook use and depressive symptomatology: Investigating the role of neuroticism and extraversion among young adults. Computers in Human Behavior. doi: 10.1016/j.chb.2014.07.039
3. Drake, C.L., Vargas, I., Roth, T., & Friedman, N.P. (2014). Quantitative measures of nocturnal insomnia symptoms predict greater deficits across multiple daytime impairment domains. Behavioral Sleep Medicine, 12, 1-15. doi: 10.1080/15402002.2014.880345
2. Vargas, I., & Lopez-Duran, N.L. (2014). Dissecting the impact of sleep and stress on the cortisol awakening response among healthy young adults. Psychoneuroendocrinology, 40(1), 10-16. doi: 10.1016/j.psyneuen.2013.10.009 
1. Haeffel, G.J. & Vargas, I. (2011). Resilience to Depressive Symptoms: The Buffering Effects of Enhancing Cognitive Style and Positive Life Events. Journal of Behavior Therapy and Experimental Psychiatry, 42(1), 13-18. doi 10.1016/j.jbtep.2010.09.003
