Direct quotation, paraphrase, and summary are all the ways writers can incorporate sources in their writings. Option A is correct.
Sources in a piece of academic writing refers to all the materials from which the writer gathers ideas and information. For instance, print sources such as books and journals are the most generally used sources in academic writing, however, nowadays, many sources can be found on the Internet, but it is necessary toprove the information obtained is reliable and accurate.
