APA (7e ed.) Bronvermelding

Northrup, H. R. (1983). The International Transport Workers' Federation and flag of convenience shipping. Industrial Research Unit, Wharton School, University of Pennsylvania.

Chicago (17e ed.) Bronvermelding

Northrup, Herbert R. The International Transport Workers' Federation and Flag of Convenience Shipping. Philadelphia, Pa: Industrial Research Unit, Wharton School, University of Pennsylvania, 1983.

MLA (9e ed.) Bronvermelding

Northrup, Herbert R. The International Transport Workers' Federation and Flag of Convenience Shipping. Industrial Research Unit, Wharton School, University of Pennsylvania, 1983.