Dyfyniad APA

American Library Association. Reference and Subscription Books Review Committee. Purchasing an encyclopedia: 12 points to consider.

Dyfyniad Arddull Chicago

American Library Association. Reference and Subscription Books Review Committee. Purchasing an Encyclopedia: 12 Points to Consider. Chicago, 1979.

Dyfyniad MLA

American Library Association. Reference and Subscription Books Review Committee. Purchasing an Encyclopedia: 12 Points to Consider.

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