Model References and Slow Build Issue

I am developing Sales Order Report using extension methodology and RDP class. I am using SalesTable and SalesLine. When I build it, it asked me to add reference. I added. It has again asked me to add another reference. I added.
Then it started giving error like this: A reference to 'Dynamics.AX.Retail, Version=0.0.0.0, Culture=neutral, PublicKeyToken=null' is required to compile this module.

I added Retail and other modules (Source Documentation, Sales Contact etc. etc.) as reference it asked me in error like above.
On every build it takes a long time, kindly guide me. I am new at Microsoft Dynamics 365 FO.

Regards,
Moeen Ahmed Sultan