Cita APA (7a ed.)

Jeffreys, H. (1929). The future of the Earth. K. Paul, Trench, Trubner.

Cita Chicago Style (17a ed.)

Jeffreys, Harold. The Future of the Earth. London: K. Paul, Trench, Trubner, 1929.

Cita MLA (8a ed.)

Jeffreys, Harold. The Future of the Earth. K. Paul, Trench, Trubner, 1929.