Spencer, H. (1902). Facts and comments (4th thousand.). Williams & Norgate.
Cita Chicago Style (17a ed.)Spencer, Herbert. Facts and Comments. 4th thousand. London [etc.]: Williams & Norgate, 1902.
Cita MLA (9a ed.)Spencer, Herbert. Facts and Comments. 4th thousand. Williams & Norgate, 1902.
Precaución: Estas citas no son 100% exactas.