GetReferencedAssemblies doesn't return all assemblies

I have the following code inside a Form, and am attempting to find a way to load a project assembly referenced by the form called DataObjects. Using the following code, I only get six assemblies listed. Looking at the references for the project the form is in, there are thirteen assembly references. What is wrong here?

private void ListReferencedAssemblies()
{
    var assemblies = Assembly.GetExecutingAssembly().GetReferencedAssemblies();
    foreach (var assembly in assemblies)
    {
        referencesListBox.Items.Add(assembly.Name);
    }
}