Tracy, B. (2002). Focal point: A proven system to simplify your life, double your productivity, and achieve all your goals. AMACOM.
Citazione stile Chigago Style (17a edizione)Tracy, Brian. Focal Point: A Proven System to Simplify Your Life, Double Your Productivity, and Achieve All Your Goals. New York: AMACOM, 2002.
Citatione MLA (9a ed.)Tracy, Brian. Focal Point: A Proven System to Simplify Your Life, Double Your Productivity, and Achieve All Your Goals. AMACOM, 2002.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.