Tuplin - - Xenophon The Encyclopædia Britannica [Retrieved 2015-3-24] ↑ V. Ehrenberg - From Solon to Socrates: Greek History and Civilization During the 6th and 5th Centuries BC (p.373) Routledge, 22 May 2014 ISBN 1136783946 [Retrieved 2015-3-24] ↑ RC.