Grorge, D., & Mallery, P. (2014). IBM statistics 21 step by step: A simple guide and reference (13th ed.). Pearson Education.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रGrorge, Darren, और Paul Mallery. IBM Statistics 21 Step by Step: A Simple Guide and Reference. 13th ed. U.S.A.: Pearson Education, 2014.
एमएलए (8वां संस्करण) प्रशस्ति पत्रGrorge, Darren, और Paul Mallery. IBM Statistics 21 Step by Step: A Simple Guide and Reference. 13th ed. Pearson Education, 2014.
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