APA (7e ed.) Bronvermelding

(1977). Shipping Statistics Yearbook: Shipping Markets, Shipbuilding, Ports and Sea Canals / Institute of Shipping Economics and Logistics.

Chicago (17e ed.) Bronvermelding

Shipping Statistics Yearbook: Shipping Markets, Shipbuilding, Ports and Sea Canals / Institute of Shipping Economics and Logistics. Bremen, 1977.

MLA (8e ed.) Bronvermelding

Shipping Statistics Yearbook: Shipping Markets, Shipbuilding, Ports and Sea Canals / Institute of Shipping Economics and Logistics. 1977.