David Davies Memorial Institute of International Studies & Sibthorp, M. M. (1975). The North Sea: Challenge and opportunity : report of a study group of the David Davies Memorial Institute of International Studies. Europa for the Institute.
Citazione stile Chigago Style (17a edizione)David Davies Memorial Institute of International Studies e M. M. Sibthorp. The North Sea: Challenge and Opportunity : Report of a Study Group of the David Davies Memorial Institute of International Studies. London: Europa for the Institute, 1975.
Citatione MLA (8a ed.)David Davies Memorial Institute of International Studies e M. M. Sibthorp. The North Sea: Challenge and Opportunity : Report of a Study Group of the David Davies Memorial Institute of International Studies. Europa for the Institute, 1975.