There are several formats for citing a webpage in a bibliography.
A bibliographic citation should supply sufficient details so that the item (book, movie, website, etc.) is uniquely identified. The most common citation styles are MLA (for the humanities), and APA style (for psychology). But many other styles exist, including CSE (for the sciences), and CMOS (The Chicago Manual of Style). Ask your teacher if they have a preference.
Here are three easy tools that offer fill-in-the-blank citations for multiple styles:
Cite This Page
Feldman, Barbara. "3 Free Web Citation Tools." Surfnetkids. Feldman Publishing. 23 Aug. 2014. Web. 23 Sep. 2014. <http://www.surfnetkids.com/tech/2914/3-free-web-citation-tools/ >.