Answered By: [Unclaimed] Last Updated: Mar 30, 2016 Views: 1776
One could argue that you do not have to cite a logo because by definition it is simply a trademark. However, given that a logo is a registered work, you could also argue in favor of providing a citation.
The main information you will need whatever style manual conventions you are using are: Corporation name, date copyrighted (if available), medium through which the image was accessed (print, Web, television, etc).
Neither the MLA not the APA guides give a sample citation for a logo specifically. What comes closest in the MLA, is the citation for an advertisement and it would be: Corporation name. Logo. Date copyrighted (if available). Web. Date you retrieved written as day/month/year.
What comes closest in the APA sample citations are the examples under Audiovisual Material. According to those, you would do the following: Corporate name. (Producer). (Date copyrighted if available). [Logo]. Available from url.
If a date is not available, then do that section as (n.d.).If the logo has a clear title, include that before the "logo" in both citation strings.