Alexandersson, G., & Nortrom, G. (1963). World shipping: An economic geography of ports and seaborne trade. Wiley.
Lua i Stíl Chicago (17ú heag.)Alexandersson, G., agus Goran Nortrom. World Shipping: An Economic Geography of Ports and Seaborne Trade. New York: Wiley, 1963.
Lua MLA (9ú heag.)Alexandersson, G., agus Goran Nortrom. World Shipping: An Economic Geography of Ports and Seaborne Trade. Wiley, 1963.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.