Cita APA (7a ed.)

Bernal, J. D. (1969). Science in history. Penguin Books.

Cita Chicago Style (17a ed.)

Bernal, John Desmond. Science in History. Harmondsworth: Penguin Books, 1969.

Cita MLA (9a ed.)

Bernal, John Desmond. Science in History. Penguin Books, 1969.