Cita APA (7th ed.)

Spencer, H. (1894). Les premiers principes. Félix Alcan.

Cita Chicago (17th ed.)

Spencer, Herbert. Les Premiers Principes. París: Félix Alcan, 1894.

Cita MLA (9th ed.)

Spencer, Herbert. Les Premiers Principes. Félix Alcan, 1894.