(1) Unless expressly provided otherwise, whenever there is a reference in this subchapter to:

(a) a federal regulation, the reference is to the July 1, 2006, edition of the Code of Federal Regulations (CFR);

(b) a section of the United States Code (USC), the reference is to the 2000 edition of the USC and Supplement III (2003); or

(c) a section of the Montana Code Annotated (MCA), the reference is to the 2005 edition of the MCA.