Παραπομπή APA

Bernal, J. D. (1969). Science in history: V3. the natural sciences in our time (3rd ed.). Penguin.

Παραπομπή Chicago Style

Bernal, J. D. Science in History: V3. the Natural Sciences in Our Time. 3rd ed. Middlesex: Penguin, 1969.

Παραπομπή MLA

Bernal, J. D. Science in History: V3. the Natural Sciences in Our Time. 3rd ed. Penguin, 1969.