4. divide by aim in classified into 3 categories. 4.1 types of textbook (Textbook) 4.2 further reading type (Complementary Readers). 4.3 promoting the reading category (Suplementry Readers).
4. By the aim of composing classified into three types of textbooks 4.1. (Textbook) 4.2 Read more books (Complementary Readers) 4.3 of promoting reading (Suplementry Readers).
4. The aim to dress can be classified into 3 types.4.1 type textbook (Textbook).4.2 type book (Complementary Readers).4.3 type reading (Suplementry Readers).