Cita APA (7a ed.)

Spencer, H. (1930). Classification des sciences (11e. èd.). Félix Alcan.

Cita Chicago Style (17a ed.)

Spencer, Herbert. Classification Des Sciences. 11e. èd. Paris: Félix Alcan, 1930.

Cita MLA (9a ed.)

Spencer, Herbert. Classification Des Sciences. 11e. èd. Félix Alcan, 1930.