Dyfyniad APA

(1988). Imports under items 806.30 and 807.00 of the tariff schedules of the United States, 1984 -87. Washington: Usitic Publication.

Dyfyniad Arddull Chicago

Imports Under Items 806.30 and 807.00 of the Tariff Schedules of the United States, 1984 -87. Washington: Usitic Publication, 1988.

Dyfyniad MLA

Imports Under Items 806.30 and 807.00 of the Tariff Schedules of the United States, 1984 -87. Washington: Usitic Publication, 1988.

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