@misc{Spencer_Herbert_(1820-1903)_Die,
 author={Spencer, Herbert (1820-1903)},
 howpublished={online},
 publisher={E. Schweizerbart'sche Verlagshandlung (E. Nägele) ; (Druck von Friedr. Scheel in Cassel)},
 language={ger},
 type={książka},
 title={Die Principien der Psychologie. Bd. 1},
 keywords={psychologia, filozofia, 20 w.},
}