Frankfort, H., Groenewegen-Frankfort, H. A., Wilson, J. A., & Jacobsen, T. (1949). Before philosophy: The intellectual adventure of ancient man; An essay on speculative thought in the ancient Near East. Penguin Books.

Frankfort, Henri, Henriette Antonia Groenewegen-Frankfort, John A. Wilson, and Thorkild Jacobsen. Before Philosophy: The Intellectual Adventure of Ancient Man; An Essay on Speculative Thought in the Ancient Near East. Harmondsworth, Middlesex,: Penguin Books, 1949.

Frankfort, Henri, et al. Before Philosophy: The Intellectual Adventure of Ancient Man; An Essay on Speculative Thought in the Ancient Near East. Penguin Books, 1949.