using System;

using System.Linq;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        var cRefs = new List<string>() {"Q8001", "Q8002"};

        var cRefColl = cRefs.Select(i => "'" + i + "'");

        var cRefStr = string.Join(",", cRefColl);

        Console.WriteLine(cRefStr);

    }

}