Textbooks, also called schoolbooks or course books, are typically used in the educational system as a teaching tool and generally contain more text than photos. They usually take the form of a hardcover or perfect bound book, and they tend to have a very high page count. There are no standard sizes for textbooks but you will find two examples below.

Hardcover Textbook

Make Your Own Textbook Design

Hardcover Textbook

Design a Textbook, Art Book Interior Industry Standard Measurements

Perfect Textbook