American Psychological Association (APA)
This style works fairly well with Mendeley, Zotero, and EndNote Basic. None of them are perfect, but their problems are different.
All of them format citations for journals and print books well. None of these reference managers force titles to be in sentence case. Sometimes databases and Web sites will export article titles as title case. Since the APA citation style requires article titles to be in sentence case, the title might need edited. Zotero is more accurate for conferences.