Hartwig, D. (2020). The 4 season solution: The groundbreaking new plan for feeling better, living well, and powering down our always-on lives (First Atria Books hardcover edition.). Atria Books.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Hartwig, Dallas. The 4 Season Solution: The Groundbreaking New Plan for Feeling Better, Living Well, and Powering Down Our Always-on Lives. First Atria Books hardcover edition. New York: Atria Books, 2020.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Hartwig, Dallas. The 4 Season Solution: The Groundbreaking New Plan for Feeling Better, Living Well, and Powering Down Our Always-on Lives. First Atria Books hardcover edition. Atria Books, 2020.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.