You may use all the information you find, such as in articles, books, or websites, in your report. However, you may not do so just as you please. If you use someone else’s publications in your report, you have to take copyright into account.
According to copyright, it is the author who determines when and where his work is published. If you do not use a person’s texts or images in your report correctly, you are in breach of his or her copyright.