I have seen several different methods for delineating a specific internalized thought a character thinks in text, but there seems to be no common agreement regarding the proper way to punctuate it. For instance: I'm not going in there, he thought. I have seen no quotes, double quotes, single quotes, italics. Now, all I can do is second guess every attempt and I keep tearing one out and applying another solution. Does anyone know the best way to handle this for a manuscript sent to an agent/publisher?