Humphreys, A. C. (1912). Lecture notes on some of the business features of engineering practice (Rev. and enl.). Department of Economics of Engineering, Stevens Institute of Technology.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रHumphreys, Alexander Crombie. Lecture Notes on Some of the Business Features of Engineering Practice. Rev. and enl. Hoboken, N.J.: Department of Economics of Engineering, Stevens Institute of Technology, 1912.
एमएलए (8वां संस्करण) प्रशस्ति पत्रHumphreys, Alexander Crombie. Lecture Notes on Some of the Business Features of Engineering Practice. Rev. and enl. Department of Economics of Engineering, Stevens Institute of Technology, 1912.
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