For complete information on punctuation, see. 1-6.10, the APA Publication Manual. Use a single space after punctuation marks that end a sentence. Use hyphens for compound words. Use an em dash to distinguish a part of a sentence that amplifies or moves away from the point. Microsoft Word usually converts two hyphens that, Numbers: spell the word. For numbers that begin a sentence, title, or text heading, writers can begin a sentence with a year expressed in numbers. for common fractions, e.g. two-thirds cup, for universally accepted expressions, e.g. Twelve Apostles, use spaces between numbers and mathematical operators. Example: a, b, cWhen using 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 ellipsis 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.