APA reference list example: Chapter in an online book. The author is listed by last name and initials: Clinton, S. J. The year is listed in parentheses, followed by a period: (1999). The chapter title is What can be done to prevent childhood obesity? The word “In” is followed by the book title: Understanding childhood obesity It is italicized and is followed by no punctuation. The pages cited are listed in parentheses, followed by a period: (pp. 81-98). The words “Retrieved from” followed by the URL, with no period at the end: http://www.questia.com/