A well-chosen quotation can have a powerful impact on your readers’ perception of your main point and on the overall quality of your document. Quotations can also add a sense of immediacy by bringing in the voice of someone who has been affected by a subject or can lend a sense of authority to your document by conveying the words of an expert. Quotations can range in form from brief partial quotations to extended block quotations. As you integrate quotations, you might need to modify them to suit your purpose and to fit the flow of your sentences. When you do, be careful to punctuate them properly.