Cochrane reviews are great to cite in academic publications due to their systematic nature but I have no idea how to cite them in APA style because there's no obvious volume or issue to use in the citation. Here's a reference I've already tried, albeit awaiting on the volume and issuing numbers I'm meant to give.
Linde K., Berner M. M., Kriston L. (2008). St John's wort for major depression. The Cochrane Database of Systematic Reviews. doi:10.1002/14651858.CD000448.pub3. PMID 18843608.