Determine what sort of Internet references you are citing first. Purdue University's Online Writing Lab MLA guide differentiates between whole websites, a single page on a website, an image on a website, an article in an online publication, an article in an online scholarly journal, an article from an online database service and a blog or message board posting.
Cite an entire website by listing the author (or editor) followed by the name of the site, the site version, name of the organization that sponsors the site, date the site was created or most recently updated, the format of the citation and the date you viewed the site. An example from the Purdue website is "The Purdue OWL Family of Sites. The Writing Lab and OWL at Purdue and Purdue U, 2008. Web. 23 Apr. 2008." For an individual page on a website, insert the title of the page before the name of the website.
Create a citation for an image by listing the artist's name, name of the work (in italics), date of its original creation, institution and city where the work is on display, name of the website where the image is displayed, medium of publication (i.e. web), and the date you viewed it. The Purdue writing site lists the following example: "Goya, Francisco. The Family of Charles IV. 1800. Museo Nacional del Prado, Madrid. Museo National del Prado. Web. 22 May 2006."
If the image is online only, use the format for citing a website with only the following changes: substitute the name of the artist for the author's name and insert the medium of the artwork--painting, photograph, digital image--after the name of the piece.
Format a citation for a web magazine article by listing author name, title of the article, title of the web magazine (italicized), publisher and date of publication, medium (web), and the date you found the article. For an article from an online scholarly journal, follow the above method. Add the volume and issue numbers (and page numbers, if available; if they are not, substitute "n. page" instead) after the title of the journal. If you found the article on an online database, add the name of the online database after the page numbers.
Make a citation for an email by listing the name of the author, the title of the message, name of the recipient, date of message, and medium: in this case, "email."
Cite a blog post or message board post by listing the author (by screen name or real name) or editor, title of the post, website name, version number if there is one, website sponsor if one exists, medium (web), and the date you accessed the post.