Use the order party, docket, then source

Error²Federal courts, Illinois courts21st and 22nd editions

An unpublished decision of the Comptroller General is cited by the party that protested, the docket the protest was filed under, then the volume or year, the source, and where the decision begins in it.¹

1. 1T1.2 Government Accountability Office (GAO). Tables: R. 10.8.1(a) Cases available on electronic media.
2. 2An error: the rule in note 1 allows one form, and this is not it.