Mich. Comp. Laws § 556.302

Sec. 202. (1) An agent has authority described in this article if the power of attorney does either of the following: (a) Cites the section in which the authority is described. (b) Refers to a heading or catchline added to sections 204 to 217 under section 108 of the legislative council act, 1986 PA 268, MCL 4.1108. (2) A power of attorney that incorporates by reference any section of sections 204 to 217 under subsection (1) incorporates the entire section as if that section were set out in full in the power. (3) A principal may modify authority incorporated by reference.