Reference Unable to Find and Add in ASP.NET MVC Solution

I added "Microsoft.Owin.Security" in references but still showing error.

using Microsoft.Owin.Security.ProVida.Provider;

Code :

public ProVidaAuthenticationOptions GetAuthenticationOptions()
{

}

Error : Error CS0246 The type or namespace name 'ProVidaAuthenticationOptions' could not be found (are you missing a using directive or an assembly reference?)