When dealing with one source or multiple authors, include the authors' names, then three ellipses, and add the last author's name. Do not include an ampersand, amp, between the ellipses and the final author. Note: For works with three or more authors, the first in-text citation is shortened to include the first author's last name followed by et al. ~ Source with three to twenty authors. For all sources with three to twenty authors, include all authors on your References page. For in-text citations, sources with three or more authors may be abbreviated only by the first author's last name followed by et al. For example, Author et al. Year. Throughout your document, you should apply the following APA format guidelines: Set page margins in inches on all sides. Double-up all text, including headings. Indent the first line of each. Use an accessible font, for example Times New pt. point. or pt. Reference list entries without an author are listed alphabetically by the first significant word in the title. Ignore the words “A,” “An,” and “The” when putting your reference list in order. Start the entry with the word "Anonymous" only if the work is signed "Anonymous." If the reference has no author and is not signed. Add a lowercase letter after the year or a letter if it's not a year, for example. nd - a The Year-letter combination is used both in the text and in the reference list entry, even if the reference list entry has a more specific date. The order of letters is determined by the order of the reference list and not by the order of citations in the text. Blacksmith, 2020b