Whittington, R., & Davies, M. L. (2019). Opening strategy: Professional strategists and practice change, 1960 to today (Unabridged.). HighBridge Audio.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWhittington, Richard, और Matthew Lloyd Davies. Opening Strategy: Professional Strategists and Practice Change, 1960 to Today. Unabridged. Prince Frederick: HighBridge Audio, 2019.
एमएलए (8वां संस्करण) प्रशस्ति पत्रWhittington, Richard, और Matthew Lloyd Davies. Opening Strategy: Professional Strategists and Practice Change, 1960 to Today. Unabridged. HighBridge Audio, 2019.
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