Não informado. (1991). PAIS International in Print. Public Affairs Information Service.
Style de citation Chicago (17e éd.)Não informado. PAIS International in Print. New York: Public Affairs Information Service, 1991.
Style de citation MLA (8e éd.)Não informado. PAIS International in Print. Public Affairs Information Service, 1991.
Attention : ces citations peuvent ne pas être correctes à 100%.