Add the document number or year

Error²Federal courts, Illinois courts21st and 22nd editions

A citation to a League of Nations document carries its document number and its year, since the number is the only handle for the item and the year separates decades of committee work.¹

1. 1R. 21.8 League of Nations.
2. 2An error: the rule in note 1 allows one form, and this is not it.