Levy, Gertrude Rachel. The Gate of Horn: A Study of the Religious Conceptions of the Stone Age and Their Influence Upon European Thought. Harper TorchBooks, TB 10. New York: Harper & Row, 1963. xxxii, 349 p., 21 cm. Paperback cover design.
IDEA is becoming IDA, ismardavidarchive.org, a more wide-ranging exploration of the life, times and work of Ismar David.