There are many citation generators available online to help you format citations.
Some automatically generate the citation with a website or book title. While convenient (and often awesome), this is not the most accurate tool.
Others ask you to input the relevant information. Using that information, they will then generate the citation in the correct format. These tools are often more accurate.
For any online citation generator, it is YOUR responsibility to make sure the citations are correct.
More information about recommended citation generators are below.
Google Docs has an integrated citation tool. This is Ms. Bredberg's top recommendation.