Dyfyniad APA

(2021). State of the Federal Depository Library Program. Executive summary.

Dyfyniad Arddull Chicago

State of the Federal Depository Library Program. Executive Summary. 2021.

Dyfyniad MLA

State of the Federal Depository Library Program. Executive Summary. 2021.

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