Use the delimiter this series takes

Error²Federal courts, Illinois courts21st and 22nd editions

New Zealand law reports set the year in parentheses when their volume numbers run in one continuous sequence, and in brackets when a new sequence starts each year.¹

1. 1T2.30 New Zealand; T2.29 New Zealand. Tables: T10.3 Countries and Regions.
2. 2An error: the rule in note 1 allows one form, and this is not it.