Helmer, R. G. (1998). Time management: For engineers and constructors. American Society of Civil Engineers.
Citace podle Chicago (17th ed.)Helmer, Ray G. Time Management: For Engineers and Constructors. Washington, D.C: American Society of Civil Engineers, 1998.
Citace podle MLA (9th ed.)Helmer, Ray G. Time Management: For Engineers and Constructors. American Society of Civil Engineers, 1998.
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