APA

Douglas William O,, . (1968). Towards a global federalism. New York: New York University Press.

Chicago

Douglas William O,, . 1968. Towards a global federalism. New York: New York University Press.

Harvard

Douglas William O,, . (1968). Towards a global federalism. New York: New York University Press.

MLA

Douglas William O,, . Towards a global federalism. New York: New York University Press. 1968.