@misc{Spencer_Herbert_(1820-1903)_Zasady,
 author={Spencer, Herbert (1820-1903)},
 howpublished={online},
 publisher={Drukarnia Maryi Ziemkiewicz},
 language={pol},
 type={książka},
 title={Zasady socyologii. T. 2},
 keywords={socjologia, 19 w.},
}