These searches were conducted in the APA PsychInfo database and are limited to peer reviewed articles. At the bottom of the page I converted the third search into a format you can use in PubMed.
Search 1: General
line 1: ptsd or posttraumatic (subject)
line 2: treatment or therapy or psychotherapy or counseling or intervention (subject)
line 3: evidence or "best practices" (abstract)
This search retrieved 2,094 citations.
Search 2: Limit to Empirical Studies
line1: ptsd or posttraumatic (subject)
line 2: cbt or cognitive behavior* (subject)
line 3: evidence or "best practices" (abstract)
Under Methodology options, choose "empirical study." This retrieved 187 peer reviewed articles. If you want to determine if anyone has done a literature review on your topic, you could choose "literature review" instead.
Search 3: Limit by Age Groups
line1: ptsd or posttraumatic (subject)
line 2: prolonged exposure therapy (subject)
line 3: evidence or "best practices" (abstract)
Under age groups I chose "middle age" and found 18 peer reviewed citations.
Search 4: Limiting by Behavioral Activation
line 1: depression (subject)
line 2: cbt or cognitive behavior* (subject)
line 3: behavioral activation (abstract)
This search retrieved 145 peer reviewed articles.
Sample PubMed Search
(ptsd or posttraumatic) and "prolonged exposure therapy" and (evidence or "best practices")
This search retrieved 94 citations.