Petersen, Nikolaj. “Barbara G. Haskel: The Scandinavian Option. Opportunities and Opportunity Costs in Postwar Scandinavian Foreign Policies. (Universitetsforlaget, Oslo, 1976). 266 S”. Historie/Jyske/Samlinger, bd. 11, januar 1978, https://tidsskrift.dk/historiejyskesamling/article/view/39240.