American Association of School Librarians & ebrary, Inc. (2009). Standards for the 21st-century learner in action. American Association of School Librarians.
芝加哥风格引文American Association of School Librarians 与 Inc ebrary. Standards for the 21st-century Learner in Action. Chicago, Ill.: American Association of School Librarians, 2009.
MLA引文American Association of School Librarians 与 Inc ebrary. Standards for the 21st-century Learner in Action. American Association of School Librarians, 2009.
警告：这些引文格式不一定是100％准确.