Olufsen, O. (1920) “The Literary Dig-est Liberty Map of New Europe. Revealing- the great changes broug-ht about by the World War 1914—19 With complete Index. Funk J. Wag-nails, Publishers. New York. 1:4,560,000”., Geografisk Tidsskrift, 25. Tilgængelig hos: https://tidsskrift.dk/geografisktidsskrift/article/view/47099 (Set: 5 december 2025).