MyBib is an excellent citation generator that also provides a credibility rating on your sources. It also creates warnings if the capitalization in the automatic citation seems incorrect or if it could not find important information.
KnightCite
Knight Cite is a very reliable citation generator where you have control of entering all of the information about your sources.
Citation Machine
Citation Machine and other "Chegg service" citation generators like EasyBib are what most students are familiar with. Watch out for capitalization errors and check for excessive or misplaced information.
