How to Cite a Photograph

 

How to Cite a Photograph as a Genealogical Source

An old photograph is not just a keepsake. It is a source — a piece of evidence that documents a person's appearance, their clothing, their companions, and the approximate era in which they lived. And like every other source in genealogy, it needs a citation that tells future researchers what the photograph shows, where it came from, and how you know what you know about it.

What a Photograph Can Tell You

Photographs are evidence of physical appearance at a specific moment in time. They can confirm family resemblances, establish approximate ages, identify military uniforms and insignia, reveal economic status through clothing and settings, and show family groupings that confirm relationships. A photograph of a man in a Civil War uniform is evidence of military service. A photograph of a couple with six children is evidence of family composition. A studio portrait with the photographer's name and address on the back can be dated and geolocated.

But a photograph only tells you these things if you know who is in it, approximately when it was taken, and who identified the subjects. Without that context, it is just an image of unidentified people — and unidentified photographs are genealogy's greatest missed opportunity.

What to Include in Your Citation

A photograph citation should include: a description of the subject (who is pictured, if known), the approximate date (or the method you used to estimate the date — clothing style, photographic format, studio imprint), the photographer or studio (if identified, often printed on the mount or reverse), who currently holds the original photograph, and who identified the subjects.

The last point is critical. If your mother told you the photograph shows her grandmother, that identification is oral information — primary if your mother knew her grandmother personally, secondary if she is repeating what she was told. The identification itself needs to be cited. "Identified as Rosa Lombardi by her granddaughter Maria Lombardi, personal communication, January 2025" tells a future researcher exactly how the identification was made and by whom.

A photograph citation: [Description of subject] ([approximate date]), [photographer/studio if known]; [photographic format if identifiable]; [current owner/collection]. Subjects identified by [name], [relationship], [date of identification].

Dating Photographs by Format

The physical format of a photograph is itself evidence of its approximate date. Daguerreotypes were produced from the 1840s to the early 1860s. Ambrotypes from the mid-1850s to the mid-1860s. Tintypes from the 1860s through the early 1900s. Cartes de visite (small card-mounted prints) from the early 1860s to the 1880s. Cabinet cards (larger card-mounted prints) from the 1870s to the early 1900s. Postcards from the 1900s onward. Snapshots on paper from the 1890s onward.

If you can identify the format, you can narrow the date range before you even look at the clothing or setting. A daguerreotype cannot be from 1890. A carte de visite is unlikely to be from 1840. This is basic physical evidence that belongs in your citation.

Check the back of the photographMounted photographs often have the photographer's name, studio address, and sometimes a design on the reverse. This information can date and geolocate the photograph. Search for the photographer's name in city directories to find the years they operated at that address. Some researchers have compiled databases of historical photographers — these can narrow a photograph's date to within a few years.

Photographs in Archives and Online Collections

If the photograph is held in an archive, library, or online collection rather than a private family collection, cite the repository and any collection or accession number. The Library of Congress, state historical societies, and university archives all hold photograph collections relevant to genealogy. Online platforms like the DeadFred photograph identification project and the Lost Relatives photograph sharing community can sometimes help identify unknown subjects.

Write on the Back — Carefully

If you own family photographs and you know who is pictured, write the identification on the back in pencil (never ballpoint pen, which can damage the image). Include the names, the date of the photograph if known, and your name and the date you made the identification. You are creating a source for future researchers. Without your pencil note, the photograph becomes unidentified the moment the last person who recognises the faces is gone.