Some Header Issues

I'm pretty sure I know what the issue is, though I could be wrong. My headers seem to be conflicting with each other. I have two custom classes so far, both defined in seperate files. In one class's header I include the other custom class, and I also include it in my main file. I can remove any inclusion and the problem is fixed, but I wanted to know the cleanest and best way to organize my header inclusions. The files are as such: main.cpp

#include <cstdlib>
#include <windows.h>
#include <gl\gl.h>
#include <gl\glu.h>
#include <gl\glaux.h>
#include "GameMap.h"
#include "Texture.h"

GameMap.cpp

#include "GameMap.h"

GameMap.h

#include <cstdlib>
#include <iostream>
#include <cstdarg>
#include "Texture.h"

Texture.cpp

#include "Texture.h"

Texture.h

no includes

That's the general strcture. Thanks in advance for any and all help ^^ Meow