Gradovsky, Alexander Dmitrievich (1841-1889).The start of Russian state law / [cit.] A. Gradovsky, prof.Imp.S.-Petersburg.un-ta.T. 1-3.- St. Petersburg: Type.M. Stasyulevich, 1875-1881.-3 t .;24. -Bibliogr.in notes..Electronic Source: PBT. 2: Controls.- 1876. -Viii, 355 s .. -.Electronic Source: PB