Wittmann, D. (2019). Managing relationships and psychosexual therapy of individuals. In D. Kissane & M. Watson (Eds.), Psycho-Oncology Companion Guides for Clinicians: Sexual Health, Fertility and Relationships. Oxford University Press.
Agochukwu, N., & Wittmann, D. (2019). Stress, Depression, Mental Illness and Men's. In A. Y. Faysal (Ed.), Effects of Lifestyle on Men's Health. Elsevier.
Wittmann, D. (2018). Integrating post-prostatectomy sexuality: Couples' journey. In J. Ussher, J. Perz, & S. Rosser (Ed.), Gay and Bisexual Men Living with Prostate Cancer: From Diagnosis to Recovery. Harrington Park Press, distributed by Columbia University Press, New York, NY.
Stoffel, J., Elliott, S. L., Van der Aa, F., Wittmann, D., & Yande, S. (2017). Neurogenic bowel, fertility, and sexuality in the spinal cord injured patient. In R. Gomez & S. Elliott (Eds.), Urologic Management of the Spinal Cord Injured Patient: A Joint SIU-ICUD International Consultation. Buenos Aires, Argentina, October 22, 2016. Societe Internationale d'Urologie (SIU), Montreal, Quebec, Canada.