Why Should We Study Them?. Archives of Sexual Behavior (SpringerPublishing(英语:SpringerPublishing)). 2013-01-04, 31 (4). (原始内容存档于2013-01-04). , Volume 31
简明摘要 (28 July 2010). Kaufman, Alan S. IQ Testing 101. New York: SpringerPublishing. 2009: 220–222. ISBN 978-0-8261-0629-2. (原始内容使用|archiveurl=需要含有|url=