Wichmann Matthiessen, C. (1987) “Ronald Perry, Ken Dean, Bryan Brown: Countemrbanisatin: international case studies of socio-economic change in the rural areas”., Geografisk Tidsskrift, 87. Tilgængelig hos: https://tidsskrift.dk/geografisktidsskrift/article/view/44419 (Set: 6 december 2025).