The veto power of the governor shall not extend to measures referred to the people. All elections on measures referred to the people shall be had at the general state elections, except when the general assembly shall order a special election. Any measure referred to the people shall take effect when approved by a majority of the votes cast thereon, and not otherwise. This section shall not be construed to deprive any member of the general assembly of the right to introduce any measure.

Source: Const. of 1875, Art. IV, § 57.

  (1956) As general rule after a measure is passed by the legislature, approved by voters on referendum and proclaimed to be in effect, it will not be held invalid because of procedural errors occurring during the course of its adoption. Brown v. Morris, 365 Mo. 946, 290 S.W.2d 160.

  (1956) Where bill was referred by a provision of the bill, the signature of the speaker of the house was not necessary to constitute the bill a valid enactment after its approval by people. Brown v. Morris, 365 Mo. 946, 290 S.W.2d 160.