Elrod, H. (2019). The miracle equation: The two decisions that move your biggest goals from possible, to probabe, to inevitable. Harmony Books.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Elrod, Hal. The Miracle Equation: The Two Decisions That Move Your Biggest Goals from Possible, to Probabe, to Inevitable. New York: Harmony Books, 2019.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Elrod, Hal. The Miracle Equation: The Two Decisions That Move Your Biggest Goals from Possible, to Probabe, to Inevitable. Harmony Books, 2019.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.