APA (7 वां संस्करण) प्रशस्ति पत्र
ebrary, Inc, Engestrom, Y., & Kerosuo, H. (2007). Activity theory and workplace learning. Emerald Group Publishing.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र
ebrary, Inc, Yrjo Engestrom, और Hannele Kerosuo. Activity Theory and Workplace Learning. Bradford, England: Emerald Group Publishing, 2007.
एमएलए (9वां संस्करण) प्रशस्ति पत्र
ebrary, Inc, et al. Activity Theory and Workplace Learning. Emerald Group Publishing, 2007.
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