Skip a space after the last sentence in the abstract and type the word "Keywords" in italics followed by a colon. Justify the word with the left margin that is aligned down the page.
Enter the first keyword in lowercase letters, add a comma, and enter the next word. For example in a paper about television's effect on youth violence you could write, "Keywords: violence, guns".
Write the last keyword without using a period or any other punctuation at the end of the word. The list could look like this: "Keywords: guns, violence, television, inciting".