Mo. Rev. Stat. § 21.300: By whom signed, where published.

The notice shall state the substance of the contemplated law, shall be signed by ten householders of the county or incorporated city or town where the notice is published and shall be inserted in four separate publications of the newspaper. The first insertion shall be at least thirty days prior to the introduction of the contemplated bill. Notice given by handbills shall be posted at least thirty days prior to the introduction of the contemplated bill and notice shall be recited in the bill, according to its tenor.