Christiansen, S. (1992) “Dov Nir: Region as a socio-environmental system: an introduction to a systemic regional geography. (GeoJournal library, vol. 16)”., Geografisk Tidsskrift, 92. Tilgængelig hos: https://tidsskrift.dk/geografisktidsskrift/article/view/44915 (Set: 5 december 2025).