Petition for Referendum.
   Section 51. No ordinance passed by the Village Commission, unless it be an emergency measure or the annual appropriation ordinance, shall go into effect until twenty days after its final passage. If, at any time within said twenty days a petition signed by not less than fifty qualified electors of the village, be filed with the village clerk, requesting that any such ordinance be repealed or amended as stated in the petition, it shall not become operative until the steps indicated herein have been taken. Such petition shall have stated therein the names of at least five electors as a committee to represent the petitioners.
   Referendum petitions need not contain the text of the ordinance or ordinances the repeal of which is sought; but shall contain the proposed amendment, if an amendment is demanded, and shall be subject in all other respects to the requirements for petitions submitting proposed ordinances to the Village Commission. Ballots used in referendum elections shall conform in all respects to those provided for in the case of initiative ordinances.