Begin with the name of the photographer, who is the "author" for this source.
Write the title of the photograph, if provided, in italics. If a title is not provided, then specify that it is untitled and describe the content; e.g., "Untitled photograph of a 18th-century New England house."
Specify the medium by writing "Photograph." If you're following a specific formatting style, such as APA, you may need to place the description of the medium in brackets; otherwise, simply follow the statement with a period.
Provide publication or location information: the date of publication or creation, the location and title of the archive, and a retrieval statement if it was accessed from the Web.