65 ILCS 85/6

Within thirty days after any ordinance providing for the issuance of refunding revenue bonds has been passed, it shall be published once in a newspaper published and having general circulation in such city, village or incorporated town, or if there be no newspaper published in such city, village or incorporated town, then by posting in at least three of the most public places in such city, village or incorporated town, and such ordinance shall not become effective until ten days after its publication or posting, as the case may be.