אחוות הגולגולת והעצמות – הבדלי גרסאות

* Robbins, Alexandra. '''Secrets of the Tomb: Skull and Bones, the Ivy League, and the Hidden Paths of Power'''. Back Bay Books, 2003. {{ISBN |0-316-73561-2}}.

* Sutton, Antony C. '''America's Secret Establishment: An Introduction to the Order of Skull & Bones. Walterville, OR: Trine Day''', 2003. {{ISBN |0-9720207-0-5}}.

* Tedford, Cody. '''Powerful Secrets'''. Hannover, 2008. {{ISBN |1-4241-9263-3}}.