APA

Cumper G. E., . (1991). The evaluations of national health systems. Estados Unidos: Oxford University Press.

Chicago

Cumper George E, . 1991. The evaluations of national health systems. Estados Unidos: Oxford University Press.

Harvard

Cumper G. E., . (1991). The evaluations of national health systems. Estados Unidos: Oxford University Press.

MLA

Cumper George E, . The evaluations of national health systems. Estados Unidos: Oxford University Press. 1991.