Cita APA (7th ed.)

Devas, C. S. (1906). The key to the world's progress, being an essay on historical logic. Longmans, Green and Co..

Cita Chicago (17th ed.)

Devas, Charles Stanton. The Key to the World's Progress, Being an Essay on Historical Logic. London: Longmans, Green and Co., 1906.

Cita MLA (8th ed.)

Devas, Charles Stanton. The Key to the World's Progress, Being an Essay on Historical Logic. Longmans, Green and Co., 1906.