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"CHENEY FINALLY BREAKS SILENCE / Vice president defends decision not to reveal shooting for a day" by Carolyn Lochhead, www.sfgate.com. February 16, 2006.
Dr. Robert C. Worstell, James Breckenridge Jones, Napoleon Hill (2015). “Think and Grow Rich, Updated and Complete - With If You Can Count to Four...”, p.12, Lulu.com