Item Drop At entity event

I got this code to work when a player kills a zombie & other mobs
How can I make it drop a custom item? I know how to make it spawn an entity but just not a item. heres the code:

Code:

@EventHandler
    public void money(EntityDeathEvent event)
    {
        //Entity Killed
        Entity deadEntity = event.getEntity();
        //Entity Killer
        Entity killer = event.getEntity().getKiller();
       
        if(killer instanceof Player)
        {
            if(deadEntity instanceof Zombie || deadEntity instanceof Skeleton)
            {
                deadEntity.getWorld().spawnEntity(deadEntity.getLocation(), EntityType.WITHER_SKULL);
               
            }
        }
    }

 

http://jd.bukkit.org/rb/apidocs/org/bukkit/World.html#dropItem(org.bukkit.Location, org.bukkit.inventory.ItemStack) See if you can figure out how to use that method from there.

 

If you're going to drop multiple items, I recommend you to use World#dropItemNaturally(), because this drops the items with a random offsets, so the items aren't all dropped on the exact same place.