Hyatt, M. S. (2019). Free to focus: A total productivity system to achieve more by doing less. Baker Books, a division of Baker Publishing Group.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Hyatt, Michael S. Free to Focus: A Total Productivity System to Achieve More by Doing Less. Grand Rapids, Michigan: Baker Books, a division of Baker Publishing Group, 2019.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Hyatt, Michael S. Free to Focus: A Total Productivity System to Achieve More by Doing Less. Baker Books, a division of Baker Publishing Group, 2019.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.