Cumper,George E. (1991). The evaluation of national systems. Oxford University Press.
Citazione stile Chigago Style (17a edizione)Cumper,George E. The Evaluation of National Systems. New york: Oxford University Press, 1991.
Citatione MLA (8a ed.)Cumper,George E. The Evaluation of National Systems. Oxford University Press, 1991.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.