Dyfyniad APA

American Library Association & Article 19 (Organization). (1991). Information freedom and censorship: World report 1991. American Library Association.

Dyfyniad Arddull Chicago

American Library Association and Article 19 (Organization). Information Freedom and Censorship: World Report 1991. Chicago: American Library Association, 1991.

Dyfyniad MLA

American Library Association and Article 19 (Organization). Information Freedom and Censorship: World Report 1991. American Library Association, 1991.

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