Mich. Comp. Laws § 123.373

Sec. 13. Unless otherwise provided in this act, the powers herein conferred upon cities and villages shall be exercised by their respective governing bodies; and this act shall be construed as authorizing the issuance of bonds hereunder without submitting the proposition for the approval of the same to voters of the borrower, and the authorization and issuance of bonds pursuant to this act shall not be subject to a referendum vote of the electors of the city and village.