
Ten Days That Shook the World (1919) is a book by the American journalist and socialist John Reed. Here, Reed presented a firsthand account of the 1917 Russian October Revolution. Reed followed many of the most prominent Bolsheviks closely during his time in Russia. )
But really it's such a pivotal moment in modern history that you're not going to starve for material. It sounds glib, but in this instance you could do worse than start on Wikipedia: https://en.wikipedia.org/wiki/Russian_Revolution