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. Indicate the type of file: “JPEG file,” “PDF file,” “MP3 file,” at the end of the entry.
Hine, Lewis W. Girl in Cherryville Mill. 1908. Prints and Photographs Division, Library of Congress. JPG file.
“Scenes from a Recession.” This American Life. Narrated by Ira Glass, NPR, 30 Mar. 2009. MP3 file.
National Institute of Mental Health. What Rescue Workers Can Do. US Department of Health and Human Services, 2006. PDF file.