Access Nop.Services into windows service project

I want to access the Nop.Service into my windows service project.

There might be some depandancy issue I might be facing.

Do you have any example to access the nop.Services into my windows service project.

Notes:
- I have added reference of nop.Core, nop.Data, nop.Services.
- I am using nopCommerce 2.8 version.