The journal of the senate must be authenticated by the signature of the president and the journal of the house of representatives by the signature of the speaker. Each authenticated journal must be filed with the secretary of state. A copy of each authenticated journal must be filed with the legislative services division.
Mont. Code Ann. § 5-11-201
Journals -- how authenticated -- filing
En
Official source: Montana Code Annotated (Montana Legislature). Reproduced from public-domain Montana statutes; confirm against the official source for the current text. Not legal advice.