Unity 4.3 How to load sprites from a sprite?

This is the way how to load Sprites from Resource:

 Sprite[] sprites = Resources.LoadAll<Sprite>("UI/Textures/aPNGImage");

But I have a class, like this:

 public class ClassA : MonoBehaviour {
 public Sprite aSprite;
 
 public void Start()
 {
     int count = this.Count(this.aSprite);
     Debug.Log(count);
 }
 
 public int Count(Sprite aSprite)
 {
     //That's why I don't want to loadd sprites from Resources
     //I just want to load sprites from some sprite I dragged from Inspector
     return LoadAll<Sprite>(aSprite).Lenght;  
     //Is there any way can I load Sprites from object reference like this  
 }
 }