Try this page (http://a-pesni.golosa.info/romans/2gitary.htm) for several variants of the lyrics and written melody with guitar chords. I've found this to be a reliable site, with source citations, multiple versions and, usually, sheet music scans. It is also perhaps the most complete collection of Russian folk song lyrics on the net.

The original words were written by Appolon Grigor'ev (1822-1864), to a Hungarian gypsy motif, though the music is often attributed to I. Vasil'ev.