Citations generated online using citation generators (ex. Citation Machine), exported from citation managers (ex. Noodle Tools), or directly by clicking on the "Cite" link in a database or online journal, are frequently incorrect. While these may be a good way to start off crafting your citation, you should always double check the format by consulting the official style guide or using one of these online citation style guides.
Citation Managers can help you keep track of your references and share your citations. They can help you create a bibliography and organize your work more easily.