It is necessary to include bibliographic references in books, documents, newspaper articles, among others, which are ideally referred to during the creation of reports or articles. However, as the description of the references (bibliographic references) is left to the user's discretion, their omission due to the user's carelessness is a problem. To prevent this form of reference omission, a method exists that can detect sentences created by copying them from other electronic documents. This would give the user the references that need to be mentioned at the end of their article. In this paper, we will improve upon the previous method of detection accuracy for sentences created using the copy and paste operation and the process of displaying them to the user for easy understanding. Additionally, we will examine the detected sentences that are required to describe the reference that was generated without using the copy and paste operation.