Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

Bernal, J. D. Science in History. Ill. ed. Harmondsworth [etc.]: Penguin, 1969.

Cita MLA (9a ed.)

Bernal, J. D. Science in History. Ill. ed. Penguin, 1969.