In writing scholarly papers, you must keep firmly in mind the need to avoid plagiarism.
Plagiarism is the unacknowledged borrowing of another writer's words or ideas.
Different forms of writing require different types of acknowledgement. The following rules pertain to the acknowledgements necessary in academic papers. In using another writer's words, you must both place the words in quotation marks and acknowledge that the words are those of another writer. You are plagiarizing if you use a sequence of words, a sentence or a paragraph taken from another writer without acknowledging them to be his. In either case, words taken from another author must be enclosed in quotation marks or set off from your text by single spacing and indentation in such a way that they cannot be mistaken for your own words.