Παραπομπή APA

Williamson, P. R. (2001). Ship manoeuvring principles and pilotage. Witherby.

Παραπομπή Chicago Style

Williamson, Paul R. Ship Manoeuvring Principles and Pilotage. London: Witherby, 2001.

Παραπομπή MLA

Williamson, Paul R. Ship Manoeuvring Principles and Pilotage. Witherby, 2001.