Mark, G. (2023). Attention span: A groundbreaking way to restore balance, happiness and productivity. Hanover Square Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रMark, Gloria. Attention Span: A Groundbreaking Way to Restore Balance, Happiness and Productivity. Toronto, Ontario, Canada: Hanover Square Press, 2023.
एमएलए (8वां संस्करण) प्रशस्ति पत्रMark, Gloria. Attention Span: A Groundbreaking Way to Restore Balance, Happiness and Productivity. Hanover Square Press, 2023.
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