When the ghostly apparition of a long lost ancestor revealed to Carl Tanzler the appearance of his soul mate, he spent his life searching for what he believed would be his one true love. The fairy tale ending, however, was not to be as one man's love grew into a sinister obsession that even death couldn't contain.
- Diagnostic and statistical manual of mental disorders (5th ed.). Arlington, VA: American Psychiatric Publishing. The basic in-text citation should look like this: (American Psychiatric Association, 2013)