Below are four sentences from various student assignments. Select all the sentences that need in-text references. 

In order to know how to structure sentences in English, you require a basic knowledge of grammar. 


It is clear, therefore, that vocabulary development is an essential component for developing fluency in academic language. 


Hyland points out that texts that share the same purpose often share the same structure.   


A new international study shows almost 80% of South African pupils do not develop basic reading skills by the time they reach Grade 5.   

1) It is clear, therefore, that vocabulary development is an essential component for developing fluency in academic language. 

3) Hyland points out that texts that share the same purpose often share the same structure.
4) A new international study shows almost 80% of South African pupils do not develop basic reading skills by the time they reach Grade 5.   

The sentence that needs an in-text reference is:

Hyland points out that texts that share the same purpose often share the same structure.