Abstract
Text linguistics is a branch of linguistics that focuses on the meaning and interpretation of written textbooks. This type of linguistics deals with the ways in which a spoken word can make sense, both small and large. Textbooks serve two functions internal and external. This is considered in agreement with the introductory principles of textbook linguistics, so that intertextuality can be understood as an external function of the textbook. The conception of intertextuality is the study of the connections between different textbooks. In numerous cases it's necessary to study one or further textbooks to understand the purpose.