Add the database's document code

Warning²Federal courts, Illinois courts21st and 22nd editions

A book cited to a commercial electronic database also carries the code the database assigns the document, such as “Westlaw LDCHBK”, rather than the service's name standing alone.¹

1. 1R. 15.9(a) Commercial electronic databases.
2. 2A warning: the form is usually wrong under the rule in note 1, and context can justify it.