Referencing the complete manual
Reference list entry (print version):
American Psychiatric Association. (2022). Diagnostic and statistical manual of mental disorders (5th ed., text rev.).
Reference list entry (online version):
American Psychiatric Association. (2022). Diagnostic and statistical manual of mental disorders (5th ed., text rev.). https://doi.org/10.1176/appi.books.9780890425787
Referencing an entry in the manual
Reference list entry (print version):
American Psychiatric Association. (2022). Generalized anxiety disorder. In Diagnostic and statistical manual of mental disorders (5th ed., text rev.).
Entry in DSM-5 (online version)
American Psychiatric Association. (2022). Generalized anxiety disorder. In Diagnostic and statistical manual of mental disorders (5th ed., text rev.). https://doi.org/10.1176/appi.books.9780890425787.x05_Anxiety_Disorders
Note: Because the author and publisher are the same, only use the name in the author field to avoid repetition. For further information, see APA Style.