Good for you in asking for help & learning more about it. A friend of mine w borderline pd who cuts said this book was recommended by her psychotherapist:

Freedom from Selfharm: Overcoming Self-Injury with Skills from DBT and Other Treatments
ISBN-(Phone number can only be seen by the question and answer creators), ISBN-(Phone number can only be seen by the question and answer creators)

Also she is looking to start Eye movement desensitization and reprocessing (EMDR) for complex trauma. Hope it helps