Add the year or cover date

Error²Federal courts, Illinois courts21st and 22nd editions

A periodical is cited with the year in parentheses after the page (consecutive pagination) or with its cover date in front of the page (nonconsecutive); a citation that gives neither leaves the reader unable to tell which issue is meant.¹

1. 1R. 16.4 Consecutively Paginated Journals; R. 16.5 Nonconsecutively Paginated Journals and Magazines.
2. 2An error: the rule in note 1 allows one form, and this is not it.