Bibliography (5):

1. https://www.thedhamma.com/buddhaslists.pdf

2. https://www.dhammawiki.com/index.php?title=David_N._Snyder

3. https://www.dhammawiki.com/index.php?title=Anguttara_Nikaya

4. Wikipedia Bibliography:

   1. https://en.wikipedia.org/wiki/Theravada  :

      https://en.wikipedia.org/wiki/Theravada

   2. https://en.wikipedia.org/wiki/A%E1%B9%85guttara_Nik%C4%81ya  :

      https://en.wikipedia.org/wiki/A%E1%B9%85guttara_Nik%C4%81ya