Dyfyniad APA

(1987). Certain seamless steel pipes and tubes from Japan. Washington: USITC.

Dyfyniad Arddull Chicago

Certain Seamless Steel Pipes and Tubes From Japan. Washington: USITC, 1987.

Dyfyniad MLA

Certain Seamless Steel Pipes and Tubes From Japan. Washington: USITC, 1987.

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