American Library Association & Article 19 (Organization). (1991). Information freedom and censorship: World report 1991. American Library Association.
Cita Chicago (17th ed.)American Library Association i Article 19 (Organization). Information Freedom and Censorship: World Report 1991. Chicago: American Library Association, 1991.
Cita MLA (9th ed.)American Library Association i Article 19 (Organization). Information Freedom and Censorship: World Report 1991. American Library Association, 1991.
Atenció: Aquestes cites poden no estar 100% correctes.