Sullivan, W. G., Wicks, E. M., & Koelling, C. P. 1. (2020). Engineering economy (Seventeenth edition.). Pearson Education Limited.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रSullivan, William G., Elin M. Wicks, और C. Patrick 1953 Koelling. Engineering Economy. Seventeenth edition. United Kingdom: Pearson Education Limited, 2020.
एमएलए (9वां संस्करण) प्रशस्ति पत्रSullivan, William G., et al. Engineering Economy. Seventeenth edition. Pearson Education Limited, 2020.
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