There also many citation helpers on the internet. Remember, when you are using a citation builder you should always double check the format of the citation before including it in the final version of your paper - they may be machines but they are not always perfect!
Sometimes you need more than a quick citation builder. Besides just helping you format citations and bibliographies, citation management software allows you to organize and take notes on your sources in one place, as well as share references and collaborate on projects with colleagues.
Check out this guide to the citation management tools Mendeley and Zotero.