The library has created a handout to help work out citing different kinds of sources, including both print and online.
Here is the format that you will most commonly use for online resources. Please reference the library cheat sheet for lots of examples of different kinds of resources.
Author. “Title of Article.” Title of Web Site (homepage). Name of institution/organization
sponsoring site, Date of Posting/Revision, Date of access. (If no posting date
on Web Site), DOI or URL (omit beginning http://).