For online access to the American Psychiatric Association's Diagnostic and Statistical Manual of Mental Disorders, Fifth edition, Text Revision (and continued access to the DSM-5 pre-revisions).
PubMed is a database created by the National Library of Medicine to facilitate searching the biomedical literature. The MEDLINE databases found within PubMed contains journals that have been reviewed by a panel of experts for quality. PubMed also contains PMC, which contains publicly accessible literature that have not necessarily gone through the same review process.
Citations to literature on post-traumatic stress disorder (PTSD) and other mental-health sequelae of traumatic events, without disciplinary, linguistic, or geographical limitations; sponsored by the U.S. Department of Veterans Affairs.
The Psychotherapy.net Expanded Collection is a collection of streaming video in the fields of Psychotherapy, Counseling and Social Work, highly recommended for clinical training.