Author’s last name, First name (if available). "Title of the Webpage." Name of the Website, Date of content, URL of page.

Example:

Grades 6-8

This is what goes in your Works Cited:

"Anatomy of the Wright Glider." Smithsonian National Air and Space Museum, airandspace.si.edu/ exhibitions/wright-brothers/online/fly/1900/anatomy.cfm.

In this example, the website does not supply an author for this content, so you skip that part and move straight to the title of the webpage.