Section 13.  Referendum.
   If, before the expiration of twenty days following passage of any ordinance, a petition is filed with the Town Manager containing the signatures of not less than twenty per centum (20%) of the qualified voters of the town and requesting that the ordinance or any part thereof, be submitted to a vote of the qualified voters of the town for their approval or disapproval, the council shall have the ordinance, or the part thereof requested for referendum, submitted to a vote of the qualified voters of the town at the next regular town election or, in the council's discretion, at a special election occurring before the next regular election. No ordinance or the part thereof requested for referendum, shall become effective following the receipt of such petition until and unless approved at the election by a majority of the qualified voters voting on the question. An emergency ordinance, or the part thereof requested for referendum, shall continue in effect for sixty days following receipt of such petition. If the question of approval or disapproval of any emergency ordinance, or any part thereof, has not been submitted to the qualified voters within sixty days following receipt of the petition, then the operation of the ordinance or the part thereof requested for referendum, shall be suspended until approved by a majority of the qualified voters voting on the question at any election. Any ordinance or part thereof, disapproved by the voters, shall stand repealed. The provisions of this section shall not apply to any ordinance, or part thereof, passed under the authority of Section 53 of this Charter, levying property taxes for the payment of indebtedness, but the provisions of this section shall apply to any ordinance, or any part thereof, levying special assessment charges under the provisions of Section 77 and 78 of this Charter. The provisions of this section shall be self-executing, but the Council may adopt ordinances in furtherance of these provisions and not in conflict with them.