Guttesen, R. (1996) “I. Rønne Kejlbo: Rare Globes, a cultural-historical exposition of selected terrestrial and celestial globes made before 1859 - especially connected with Denmark”., Geografisk Tidsskrift, 96. Tilgængelig hos: https://tidsskrift.dk/geografisktidsskrift/article/view/42021 (Set: 6 december 2025).