Referendum on establishment of county library service. None of the foregoing powers or duties shall be exercised, however, unless the question of establishing a public county library service shall have been submitted to the voters of the county, at a regular election, and unless a majority of the votes cast upon the question at any such election within the limits of the cities, villages and incorporated towns in the county and a majority of those cast upon the question outside the limits of such cities, villages or incorporated towns shall be in favor of the establishment of a public county library service.
     This question shall not be submitted to the voters, however, unless there shall have been filed a petition therefor, signed by not less than one hundred legal voters of the county.
     The proposition of establishing a public county library service shall be in substantially the following form: FOR the establishment of a public county library service. AGAINST the establishment of a public county library service.