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System Reference Document, Copyright 2000, Wizards of the Coast, Inc., Authors Jonathan Tweet, Monte Cook, Skip Williams, based on original material by E. Gary Gygax and Dave Arneson.
Modern System Reference Document, Copyright 2002-2004, Wizards of the Coast, Inc.; Authors Bill Slavicsek, Jeff Grubb, Rich Redman, Charles Ryan, Eric Cagle, David Noonan, Stan!, Christopher Perkins, Rodney Thompson, and JD Wiker, based on material by Jonathan Tweet, Monte Cook, Skip Williams, Richard Baker, Peter Adkison, Bruce R. Cordell, John Tynes, Andy Collins, and JD Wiker.
Mutants & Masterminds, Copyright 2002, Green Ronin Publishing; Author Steve Kenson.
Advanced Player’s Manual, Copyright 2005, Green Ronin Publishing: Author Skip Williams.
Silver Age Sentinels d20, Copyright 2002, Guardians of Order, Inc.; Authors Stephen Kenson, Mark C. Mackinnon, Jeff Mackintosh, Jesse Scoble.
Mutants & Masterminds, Second Edition, Copyright 2005, Green Ronin Publishing; Author Steve Kenson.
DC Adventures Hero’s Handbook, Copyright 2010, Green Ronin Publishing; Author Steve Kenson.
Mutants & Masterminds Hero’s Handbook, Copyright 2011, Green Ronin Publishing; Author Steve Kenson.
Images used via the Creative Commons License