This document provides instructions for citing a periodical source in APA style. It explains that citing a source requires including specific pieces of information, like those found on an article's abstract page. These include the title, author(s), date of publication, volume and issue numbers, and page range. It also notes whether a digital object identifier or database accession number and name should be included instead of a URL. The purpose is to help students locate and organize the necessary information to create a reference list entry in NoodleTools.