5.15 @cite{reference}

Use the @cite command for the name of a book that lacks a companion Info file. For example, we could refer to A Book. The command selects a slanted font in the printed manual, and generates quotation marks in the Info file.

If a book is written in Texinfo, it is better to use a cross-reference command since a reader can easily follow such a reference in Info. See @xref.