American Library Association & Article 19 (Organization). (1991). Information freedom and censorship: World report 1991. American Library Association.
Citazione stile Chigago Style (17a edizione)American Library Association e Article 19 (Organization). Information Freedom and Censorship: World Report 1991. Chicago: American Library Association, 1991.
Citatione MLA (9a ed.)American Library Association e Article 19 (Organization). Information Freedom and Censorship: World Report 1991. American Library Association, 1991.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.