Whittington, R., & Davies, M. L. (2019). Opening strategy: Professional strategists and practice change, 1960 to today (Unabridged.). HighBridge Audio.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Whittington, Richard, و Matthew Lloyd Davies. Opening Strategy: Professional Strategists and Practice Change, 1960 to Today. Unabridged. Prince Frederick: HighBridge Audio, 2019.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Whittington, Richard, و Matthew Lloyd Davies. Opening Strategy: Professional Strategists and Practice Change, 1960 to Today. Unabridged. HighBridge Audio, 2019.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.