(1992). Oregon Intellectual Freedom Clearinghouse: Fourth Annual Report. July 1, 1990-June 30, 1991.
Citazione stile Chigago Style (17a edizione)Oregon Intellectual Freedom Clearinghouse: Fourth Annual Report. July 1, 1990-June 30, 1991. 1992.
Citatione MLA (9a ed.)Oregon Intellectual Freedom Clearinghouse: Fourth Annual Report. July 1, 1990-June 30, 1991. 1992.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.