Helmer, R. G. (1998). Time management: For engineers and constructors. American Society of Civil Engineers.
Chicagoスタイル(17版)引用形式Helmer, Ray G. Time Management: For Engineers and Constructors. Washington, D.C: American Society of Civil Engineers, 1998.
MLA(9版)引用形式Helmer, Ray G. Time Management: For Engineers and Constructors. American Society of Civil Engineers, 1998.
警告: この引用は必ずしも正確ではありません.