Warrillow, J. (2015). The automatic customer: Creating a subscription business in any industry. Portfolio.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWarrillow, John. The Automatic Customer: Creating a Subscription Business in Any Industry. New York: Portfolio, 2015.
एमएलए (8वां संस्करण) प्रशस्ति पत्रWarrillow, John. The Automatic Customer: Creating a Subscription Business in Any Industry. Portfolio, 2015.
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