im not found script sound effect for coins when collecting

please give me solution this script, i want add sound effect a coin but i not find for script .
this my code:

using UnityEngine;
using System.Collections;

public class COIN : MonoBehaviour {
gerak KomponenGerak;

// Use this for initialization
void Start () {
	KomponenGerak = GameObject.Find ("player").GetComponent<gerak> ();

// Update is called once per frame
void Update () {

void OnTriggerEnter2D(Collider2D other){
	if (other.transform.tag=="Player"){

		Destroy (gameObject);



(iam sorry my english not fluent.)

Add the following to your COIN class.

private AudioClip coinClip;

AudioSource.PlayClipAtPoint(coinClip, transform.position);

Within the Editor drop your sound file on coinSound in the Inspector.
Add the AudioSource line above just after KomponenGerak.COIN++;