Παραπομπή APA

Bernal, J. D. (1965). Science in history: V4. the social sciences: conclusion (3rd ed.). Penguin.

Παραπομπή Chicago Style

Bernal, J. D. Science in History: V4. the Social Sciences: Conclusion. 3rd ed. Middlesex: Penguin, 1965.

Παραπομπή MLA

Bernal, J. D. Science in History: V4. the Social Sciences: Conclusion. 3rd ed. Penguin, 1965.