Sproull Bob. (2018). Problem Solving, Problem Prevention and Decision Making Guide. Routledge.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रSproull Bob. Problem Solving, Problem Prevention and Decision Making Guide. Routledge, 2018.
एमएलए (9वां संस्करण) प्रशस्ति पत्रSproull Bob. Problem Solving, Problem Prevention and Decision Making Guide. Routledge, 2018.
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