APA (7th ed.) Citation

Unger, R. W. (1980). The ship in the medieval economy, 600-1600. Croom Helm.

Chicago Style (17th ed.) Citation

Unger, Richard W. The Ship in the Medieval Economy, 600-1600. London: Croom Helm, 1980.

MLA (9th ed.) Citation

Unger, Richard W. The Ship in the Medieval Economy, 600-1600. Croom Helm, 1980.