In my opinion, students usually will search too many documents, even, with the document is not necessary and is not related to the study subject. Meanwhile, the related study materials and the need to not find the subject. Students often passive in seeking documentation search mainly from books, textbooks, internet, library, ... The search for important documents and realistic, it is very difficult, sometimes costly . Sometimes, students also suffer from inconsistencies in the views of the same problem in many different materials. Finding and using the documents of foreign origin is still limited.
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