Herrmann, J., & Zürcher, E. J. (1994). History of humanity: Scientific and cultural development : from the seventh century bc to the seventh century ad. Londra: Routledge.

Herrmann, Joachim, and Erik Jan Zürcher. History of Humanity: Scientific and Cultural Development : From the Seventh Century Bc to the Seventh Century Ad. Londra: Routledge, 1994.

Herrmann, Joachim, and Erik Jan Zürcher. History of Humanity: Scientific and Cultural Development : From the Seventh Century Bc to the Seventh Century Ad. Londra: Routledge, 1994.