Laravel 5.3 - Call to undefined method Illuminate\Database\Query\Builder::withTrashed()

Laravel version that I am using is 5.3. And I am already using the trait SoftDeletes and it was imported correctly too.

namespace App\Models; 

use Illuminate\Database\Eloquent\SoftDeletes;

class Reference extends Model {

  use SoftDeletes;

  protected $fillable = [
    'client_id',
    'email'
  ];
}

When I use the methods onlyTrashed() or withTrashed() I get the error.

$reference = Reference::withTrashed()->get();

or

$reference = Reference::onlyTrashed()->get();

Error:

BadMethodCallException in Builder.php line 2450: 
Call to undefined method Illuminate\Database\Query\Builder::withTrashed()

Some methods like that are working:

Reference::find(1)->delete();
Reference::find(1)->restore();
Reference::find(1)->trashed();

What can be the problem?

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