Holiday, R. (2017). Perennial seller: The art of making and marketing work that lasts. Portfolio/Penguin.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रHoliday, Ryan. Perennial Seller: The Art of Making and Marketing Work That Lasts. New York, New York: Portfolio/Penguin, 2017.
एमएलए (8वां संस्करण) प्रशस्ति पत्रHoliday, Ryan. Perennial Seller: The Art of Making and Marketing Work That Lasts. Portfolio/Penguin, 2017.
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