1) Google - https://www.google.com/

2) Wikipedia - https://bn.wikipedia.org/

3) Ancient History Encyclopedia - https://www.ancient.eu/

4) Itibritto - http://itibritto.com/

5) Roar media - https://roar.media/bangla/main/history/the-adventure-of-petra-historical-journey-of-burckhardt-in-quest-of-mysterious-city/

6) Somewhereinblog - https://www.somewhereinblog.net/blog/AGUNPAKHI13/29909604

7) https://www.nationalgeographic.com/

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