When citing books, which of the following information is NOT typically required?

When citing books, the ISBN number is not typically required as part of the basic citation format. While including the ISBN can be helpful for identifying a specific edition or version of a book, it is not a standard requirement in most citation styles such as APA, MLA, or Chicago.

Essential information that is generally required includes the author and/or editor's name, the publication date, and the city of publication. These elements help to provide a clear reference to the source, allowing readers to locate the original work. The focus of citation is primarily on ensuring that the essential attributes of the source are presented accurately, facilitating easy access for readers. Thus, while the ISBN can enhance citation specificity, it is not universally necessary for citing books.