The journals of early travelers such as Ibn Battuta of Morocco, Zheng He of China, and Mansa Musa of Mali are examples of?

Question

http://www.sfusd.k12.ca.us/schwww/sch618/Ibn_Battuta/Ibn_Battuta_Rihla.html

http://en.wikipedia.org/wiki/Zheng_He#Cultural_echoes

http://www.blackhistorypages.net/pages/mansamusa.php

And this final site gives a connection between two of these men.

http://www.princetonol.com/groups/iad/lessons/middle/mansa.htm

just give me da answer