ISBN 0-7407-5118-2. McFarlan, Donald. The Guinness Book of Records 1991. 0851123783. 1991. Marsh, Dave. The heart of rock & soul: the 1001 greatest singles ever
Probable binary open star clusters in the Galaxy. Astronomy and Astrophysics. 1995, 302: 86–89. Bibcode:1995A&A...302...86S. Buried in the Heart of a Giant
System, a comprehensive overview The InVision Guide to a Healthy Heart (页面存档备份,存于互联网档案馆) An interactive website http://cnx.org/content/m46646/latest/ (页面存档备份,存于互联网档案馆)
Civil War, Bloomsbury Press, 2010. more on the book(页面存档备份,存于互联网档案馆) Eyal, Yonatan. "With His Eyes Open: Stephen A. Douglas and the Kansas-Nebraska Disaster