Press। পৃষ্ঠা 495। Moran, Terence P. Introduction to the History of Communication: Evolutions & Revolutions. Peter Lang Publishing, 2010. p. 181. "Historie"।
2003, "The Origins of writing" in David Crowely and Paul Heyer 'Communication in History: Technology, Culture, Society' (fourth edition) Allyn and Bacon
Quote: "Magadha power came to extend over the main cities and communication routes of the Ganges basin. Then, under Chandragupta Maurya (c.321–297 bce)