Παραπομπή APA

Boulding , K. (1964). The meaning of the twentieth centuary: The great transition. Allen and unwin.

Παραπομπή Chicago Style

Boulding , Kenneth. The Meaning of the Twentieth Centuary: The Great Transition. London: Allen and unwin, 1964.

Παραπομπή MLA

Boulding , Kenneth. The Meaning of the Twentieth Centuary: The Great Transition. Allen and unwin, 1964.