Spencer, Herbert. 1891. Progress: Its Law and Cause. In Essays: scientific, political, and speculative. Bd. 1, 8-62. London: Williams and Norgate.
(xsd:string)
Spencer, H. (1891). Progress: Its Law and Cause. In Essays: scientific, political, and speculative. London: Williams and Norgate. Bd, 1 pp. 8-62.
(xsd:string)