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.
Lua i Stíl Chicago (17ú heag.)Humphreys, 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.
Lua MLA (8ú heag.)Humphreys, 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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