@misc{Porfir'ev_Ivan_Âkovlevič_(1823-1890)_Istorìâ_1891,
 author={Porfir'ev, Ivan Âkovlevič (1823-1890)},
 address={Kazan},
 howpublished={online},
 year={1891},
 publisher={Tipografìâ Imperatorskago Universiteta},
 title={Istorìâ russkoj slovesnosti Č. 1, Drevnìj perìod. Ustnaâ narodnaâ i knižnaâ slovestnost do Petra V.},
}