Revoli︠u︡t︠s︡ionnyĭ demokrat Petr Davydovich Ballod : materialy k biografii /
Valeskaln, P. I.(Petr Ivanovich),1899-
Riga : "Zinatne,"
1987.
At head of title: Akademii︠a︡ nauk Latviĭskoĭ SSR.
Balodis, Pēters, 1839-1918.
Revolutionaries