problem: Some sources that you find online, particularly on blogs or on video-sharing sites, did not originate with the person who uploaded or published the source online. In such a case, how do you give proper credit for the source?

example: Say you need to cite President John F. Kennedy's inaugural address. You have found a video on YouTube that provides footage of the address (see image). The video was uploaded by PaddyIrishMan2 on October 29, 2006. But clearly, PaddyIrishMan2 is not the author of the video or of the address.

strategy: Start with what you know. The source is a video that you viewed on the Web. For this particular video, John F. Kennedy is the speaker and the author of the inaugural address. PaddyIrishMan2 is identified as the person who uploaded the source to YouTube.

citation: To cite the source, you can combine the basic MLA guidelines for a lecture or public address (see item 62) and for a video found on the Web (see item 56).

Because Kennedy's inauguration is a well-known historical event, you can be fairly certain that this is not the only version of the inauguration video. It is a good idea, therefore, to include information about which version you viewed as supplementary information at the end of your citation.

note: If your work calls for a primary source, you should try to find the original source of the video; a reference librarian can help.