Except in pure fiction, nearly all writing is based to some extent on other sources.
Ethics and the laws of copyright require authors to identify their sources by using citations within the body of an assignment and a reference list at the end. This ensures the reader can locate the original material to examine it. When citing, accuracy and consistency are vital.
Failure to give CREDIT to sources consulted, even if they are paraphrased or reworded, is PLAGIARISM. The University may impose penalties on students who plagiarise another's work, whether it is intentional or not.
See the Referencing guide for more information on referencing & citing.