Gaya APA

Gregory, D., Shanahan, P. (2010). The Human Element : A Guide to Human Behaviour in the Shipping Industry . United Kingdom: Penerbit The Stationery Office.

Gaya MLA

Gregory, Dik., Shanahan, Paul. "The Human Element : A Guide to Human Behaviour in the Shipping Industry". United Kingdom: Penerbit The Stationery Office, 2010. Text.