Hurd, D. L., Kipling, J. J., & Schwartz, G. I. (1964). The origins and growth of physical science. Penguin Books.

Hurd, David Leonard, J. J. Kipling, and George I. Schwartz. The Origins and Growth of Physical Science. Baltimore: Penguin Books, 1964.

Hurd, David Leonard, et al. The Origins and Growth of Physical Science. Penguin Books, 1964.