Dyfyniad APA

(1987). Long-term trends and underlying factors affecting steel consumption in the United States. Washington: U. S. department of Commerce.

Dyfyniad Arddull Chicago

Long-term Trends and Underlying Factors Affecting Steel Consumption in the United States. Washington: U. S. department of Commerce, 1987.

Dyfyniad MLA

Long-term Trends and Underlying Factors Affecting Steel Consumption in the United States. Washington: U. S. department of Commerce, 1987.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.