Digital files are any documents, images or other media that exist in digital form, independent of a Web site.
Begin with information required for the source (such as a photograph, a report, a sound recording, or a radio program), following the guidelines for the specific source. Then for the medium, indicate the type of file: “JPEG file,” “PDF file,” “MP3 file,” and so on.
Hine, Lewis W. Girl in Cherryville Mill. 1908. Prints and Photographs Div., Lib. of Cong. JPG file.
“Scenes from a Recession.” This American Life. Narr. Ira Glass. NPR, 30 Mar. 2009. MP3 file.
National Institute of Mental Health. What Rescue Workers Can Do. Washington: US Dept. of Health and Human Services, 2006. PDF file.