Market Capitalization

I am wondering if there is any authentic source to check the Market Capitalization category of the stocks. A little bit of research on Google shows that there are many thoughts.

1. Large Cap is a Stock with market capitalization > Rs.20,000 Crores
2. Mid Cap is a stock with market capitalization > Rs.5,000 Crores but < Rs.20,000 Crores
3. Small Cap is a stock with market capitalization < Rs.5,000 Crores

Two links I checked are below.  I guess I need to do lot more research.

Fundsupermart Article

Jagoinvestor Forum

Regards, Rohit