Use the source's own abbreviation

Error²Federal courts, Illinois courts21st and 22nd editions

Table T2 gives each Swedish administrative court, and each publication its decisions are cited to, one abbreviation, and the citation brackets that abbreviation after the name.¹

1. 1T2.42 Sweden; T2.40 Sweden.
2. 2An error: the rule in note 1 allows one form, and this is not it.