How to reference a .lib file in c# UWP Project

Hi 

     I am working on a Universal Windows (UWP) App. I am integrating aNative C++ Static library (.lib) to my C# project in UWP. I will get only theheader files (in include folder) and .lib file (in lib folder). I don't have access to import source.cpp files.
     In this case how do I refer the APIs written in C++ in .lib file to my C# UWP project.

Thanks in Advance
With Regards
Gokul