What is a written list of all the books used in report or book?

The written list of all the books used in a report or book is called a bibliography or a list of references.

Here's a breakdown:

* Bibliography: A list of all the sources used in the report, whether cited directly in the text or not. It's often found at the end of the report.

* List of References: A list of only the sources that are cited directly in the report. This is the more common format used in academic writing.

Both bibliographies and lists of references should follow a consistent format and style, such as MLA, APA, or Chicago.

The specific format and style you should use will depend on the guidelines of the report or the journal you are submitting to.