Jelen, F. C. (1970). Cost and optimization engineering. McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)Jelen, Frederic Charles. Cost and Optimization Engineering. New York Maidenhead: McGraw-Hill, 1970.
Lua MLA (9ú heag.)Jelen, Frederic Charles. Cost and Optimization Engineering. McGraw-Hill, 1970.
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