Mørch, H. (1973) “J. I. Clarke: Population Geography and the Developing Countries. G. T. Trewartha: The Less Developed Realm: A Geography of its Population”., Geografisk Tidsskrift, 72. Tilgængelig hos: https://tidsskrift.dk/geografisktidsskrift/article/view/45811 (Set: 7 december 2025).