Wis. Stat. § 227.05: Agency publications.

An agency, other than the Board of Regents of the University of Wisconsin System, the Technical College System Board, or the department of employee trust funds, shall identify the applicable provision of federal law or the applicable state statutory or administrative code provision that supports any statement or interpretation of law that the agency makes in any publication, whether in print or on the agency’s Internet site, including guidance documents, forms, pamphlets, or other informational materials, regarding the laws the agency administers.