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​Heffer, T., Borg, M. E., & Willoughby, T. (2025). “What Are Some of the Things You Are Worried About?”: An Analysis of Youth’s Open-Ended Responses of Current Worries. Journal of Adolescence. https://doi.org/10.1002/jad.12470
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Borg, M. E., Heffer, T., & Willoughby, T. (2024). Generational Shifts in Adolescent Mental Health: A Longitudinal Time-Lag Study. Journal of Youth and Adolescence, 54(4), 837–848. https://doi.org/10.1007/s10964-024-02095-3
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​​​Willoughby, T., Heffer, T., & Borg, M. E. (2022). Deliberate Self-injury in Children and Associations With Negative Adjustment. JAMA Pediatrics, 176(10), 1040–1043. https://doi.org/10.1001/jamapediatrics.2022.1842
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Willoughby, T., Heffer, T., Dykstra, V. W., Shahid, H., & Braccio, J. (2020). A Latent Class Analysis of Adolescents in First-Year University: Associations With Psychosocial Adjustment Throughout the Emerging Adult Period and Post-University Outcomes. Journal of Youth and Adolescence, 49(12), 2459–2475. https://doi.org/10.1007/s10964-020-01318-7
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Heffer, T., Good, M., Daly, O., MacDonell, E., & Willoughby, T. (2019). The Longitudinal Association Between Social-Media Use and Depressive Symptoms Among Adolescents and Young Adults: An Empirical Reply to Twenge et al. (2018). Clinical Psychological Science, 7(3), 462–470. https://doi.org/10.1177/2167702618812727
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Heffer, T., & Willoughby, T. (2018). The Role of Emotion Dysregulation: A Longitudinal Investigation of the Interpersonal Theory of Suicide. Psychiatry Research, 260, 379–383. https://doi.org/10.1016/j.psychres.2017.11.075
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Heffer, T., & Willoughby, T. (2017). A Count of Coping Strategies: A Longitudinal Study Investigating an Alternative Method to Understanding Coping and Adjustment. PloS One, 12(10), e0186057–e0186057. https://doi.org/10.1371/journal.pone.0186057
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Willoughby, T., Heffer, T., & Hamza, C. A. (2015). The Link Between Nonsuicidal Self-Injury and Acquired Capability for Suicide: A Longitudinal Study. Journal of Abnormal Psychology (1965), 124(4), 1110–1115. https://doi.org/10.1037/abn0000104
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