Derrick, D. (1981). Navigation For Offshore and Ocean Sailors. David&Charles.
Chicago Edition CitationDerrick, David. Navigation For Offshore and Ocean Sailors. London: David&Charles, 1981.
Deismireacht MLADerrick, David. Navigation For Offshore and Ocean Sailors. David&Charles, 1981.
Rabhadh: D'fhéadfadh nach mbeadh na deismireachtaí seo 100% cruinn i gcónaí.