Use CLIO, the libraries' primary search interface to find: books, databases, ebooks, journals, newspapers, and DVDs. For guidance about finding scholarly articles go to the articles tab.
Access to the DSM-5 is through CLIO: https://clio.columbia.edu/catalog/11100979
If we don't have a resource you need:
See the Streaming Video Research Guide for more resources
Don't forget, as a Columbia University student you have access to several newspapers that all live in CLIO: