A number of registered qualified electors of the City of Guthrie, equal to at least twenty-five percent (25%) of the total electors voting at the last preceding City general election must sign the petition. Each signer shall write after his name his address within the City of Guthrie, giving street or avenue, if any. Not more than twenty-five (25) signatures may appear on a single copy of the petition. Petitions shall be circulated only by registered qualified electors of the City and the person who circulates each copy of the petition shall sign an affidavit on the copy of the petition stating each signer thereof signed the petition in his presence, that each signature on the petition is genuine and that he believes each signer to be a registered qualified elector of the City.