Mo. Rev. Stat. § 201.060
The administrator shall promptly after the effective date of this chapter adopt plans for the administration of this service and promulgate necessary rules and regulations which, together with any amendments thereto, shall be kept on file at the principal office of the service, shall constitute a public record and be subject to inspection by any person at all reasonable times. The administrator shall also cause the plans and amendments thereto and the rules and regulations relating thereto to be published in pamphlet form, and copies thereof shall at all times be kept by the service for distribution to interested persons. No rule or portion of a rule promulgated under the authority of this chapter shall become effective unless it has been promulgated pursuant to the provisions of section 536.024.
§ 201.060, RSMo