Play Audio on Object click?

So earlier, I asked a question regarding creating a GUI on the click of an object. And I was helped out by @ahmedbenlakhdhar, @static_cast, and @Titirez5. I recently realized that I probably don't need the GUI though :/ I realized that I might need an audioclip. So, I tried to figure out how exactly it works, but I clearly was very confused.

So, here's my script. I am hoping to have it so that, rather than a texture, I get a variable for an AudioClip, and the there should be something about an AudioSource.... Anyway, here is what I have as of now:

using UnityEngine; using System.Collections;

public class Click : MonoBehaviour {

 public Texture tex;
 public GameObject MYOBJECT = null;
 //public float GUItrialone = GUI.Button(350, 350, (10, 20 "Try!"))
 bool        displayGUI = false;
 void    OnGUI()
 {
     if (!tex)
         Debug.LogError ("Really Dude? After all this, you forget a TEXTURE???");

     if (Input.GetMouseButtonUp(0))
     {
         Ray            ray = Camera.main.ViewportPointToRay(Camera.main.ScreenToViewportPoint(Input.mousePosition));
         RaycastHit    outinfo;
         
         if (Physics.Raycast(ray, out outinfo, Mathf.Infinity))
         {
             //TOUCH! Show GUI
             if (Physics.Raycast(ray, out outinfo, Mathf.Infinity))
             {
                 if(outinfo.transform.gameObject == MYOBJECT){
                     displayGUI = true;
                 }
             }

         }
     }
     if (displayGUI == true)
     {
         if(GUILayout.Button(tex))
             displayGUI = false;
         //if (GUILayout.Button (tex)) 
         //{
             //displayGUI = false;
         //}
     }


 }

}

Any help is greatly appreciated! Thank you!

EDIT:

So, here is a more updated script. My problem now is that I can't assign an AudioSource. Whenever I click to assign an AudioSource, and I look at either the Assets or the Scene tabs, it says there's none. Here it is:

using UnityEngine; using System.Collections;

public class ClickAudio : MonoBehaviour {

 public AudioSource Source;
 public AudioClip Clip;
 public GameObject MYOBJECT = null;
 bool        displayGUI = false;
 void    OnGUI()
 {
     
 
     
     if (Input.GetMouseButtonUp(0))
     {
         Ray            ray = Camera.main.ViewportPointToRay(Camera.main.ScreenToViewportPoint(Input.mousePosition));
         RaycastHit    outinfo;
         
         if (Physics.Raycast(ray, out outinfo, Mathf.Infinity))
         {
             //TOUCH! Show GUI
             if (Physics.Raycast(ray, out outinfo, Mathf.Infinity))
             {
                 if(outinfo.transform.gameObject == MYOBJECT){
                     displayGUI = true;
                 }
             }
             
         }
     }
     if (displayGUI == true)
     {

         Source.Play();
         
     }
     
     
 }

}

Again, any help is greatly appreciated!