Knight CiteOnline Writing Lab (OWL) at Purdue University
There are many citation styles. You should always use the style your teacher recommends. In most cases this will be the Modern Language Association, or MLA, style. As you move to high school and eventually college you may have teachers ask you to use different styles. Each style is slightly different, so it is important to know what style you are expected to use. Despite these differences, all citation styles share common elements. These elements are what you need to write down with each piece of information you find when researching.
Author's name - this can be a single author, a group of authors, or even a group such as the American Medical Association (AMA); or if there's an editor, be sure to get this as well.
Publication date - the year the book was printed, or the date a magazine or newspaper article was released.
Title - the title of the book, or in the case of newspapers and magazines both the title of the article and the title of the newspaper or magazine.
Place of publication - the city and state or city and country a book, magazine, or newspaper is published.
Database name or URL - use this only when citing information from an electronic source such as a database (like WorldBook Online, ProQuest or SIRS); or when citing a website that you are sure is a legitimate source [remember to use the ABCs (Authority, Bias, Currency and Common Sense) when deciding to use a website])
Date accessed - use only when citing information from an electronic source such as a database, or when citing a website.
Once you have this information you can create your bibliography or works cited easily. And there are plenty of good online tools that will help you correctly create your citation. The three sources listed above are very reliable.