A Call to Incarnational Ministry in the Face of Teen Self-Harm by Devan Grayson
Cutting: Understanding and Overcoming Self-Mutilation by Steven Levenkron. Levenkron has been working with teens who self-harm for decades.
Helping Teens Who Cut: Using DBT Skills to End Self- Injury by Michael Hollander. Primarily geared towards parents, this book shares techniques from dialectical behavior theory to help families.