Boulding, K. E. (1985). The world as a total system. London: Sage Publications.
Chicago Style aipamenaBoulding, Kenneth E. The World As a Total System. London: Sage Publications, 1985.
MLA aipamenaBoulding, Kenneth E. The World As a Total System. London: Sage Publications, 1985.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.