(1980). Pipes and tubes of iron or steel from Japan. Washington: USITC.
Dyfyniad Arddull ChicagoPipes and Tubes of Iron or Steel From Japan. Washington: USITC, 1980.
Dyfyniad MLAPipes and Tubes of Iron or Steel From Japan. Washington: USITC, 1980.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.