APA

(1991). The state of the world's children 1991. New York: Oxford University Press.

Chicago

1991. The state of the world's children 1991. New York: Oxford University Press.

Harvard

(1991). The state of the world's children 1991. New York: Oxford University Press.

MLA

The state of the world's children 1991. New York: Oxford University Press. 1991.