What part of a book lists the reference materials such as tables and charts that author used in writing book?

The part of a book that lists reference materials such as tables and charts is called the List of Tables or List of Figures.

Here's a breakdown:

* List of Tables: This section lists all the tables used in the book, usually in the order they appear. It provides a brief description of each table's content.

* List of Figures: This section lists all the figures (charts, diagrams, graphs, illustrations, etc.) used in the book, again usually in order of appearance. It also provides a short description of each figure.

These lists are typically found in the preliminary pages of a book, before the main text begins. They can be helpful for readers to quickly find specific tables or figures they're looking for.