@misc{Spencer_Herbert_(1820-1903)_Die,
 author={Spencer, Herbert (1820-1903)},
 howpublished={online},
 publisher={E. Schweizerbart'sche Verlagshandlung (E. Koch) ; (K. Hofbuchdruckerei Zu Gutenberg (Carl Grüninger)},
 language={ger},
 type={książka},
 title={Die Principien der Sociologie. Bd. 2},
 keywords={socjologia, filozofia, 19 w.},
}