APA

oram s., . (1974). ports and harbours. london: macdonald educational.

Chicago

oram sandie, . 1974. ports and harbours. london: macdonald educational.

Harvard

oram s., . (1974). ports and harbours. london: macdonald educational.

MLA

oram sandie, . ports and harbours. london: macdonald educational. 1974.