Victor Bulla, 1917, 4 July, Petrograd, Street demonstration on Nevsky Prospekt just after troops of the Provisional Government have opened fire with machine guns., Photographic print, Creative Commons - Wikipedia, LL/47054
Victor Bulla, 1917, 4 July, The shooting by the Provisional Government of a peaceful demonstration at the corner of Nevsky Prospekt and Sadovaya Street., Black and white photograph, on glass, Archives of St. Petersburg, LL/113546
Victor Bulla, 1917, 4 July, Use of the "The shooting by the Provisional Government of a peaceful demonstration at the corner of Nevsky Prospekt and Sadovaya Street." photograph in the popular press., Magazine pages, Internet - Original source ill-defined, LL/113547
