Breuning Madsen, H. (1985) “Progress in land evaluation: proceedings of a seminar on soil survey and land evaluation, Wageningen, Netherlands, 26-29 September 1983. Ed. by J. C. F. M. Haans, G. G. L. Steur, G. Heide”., Geografisk Tidsskrift, 85. Tilgængelig hos: https://tidsskrift.dk/geografisktidsskrift/article/view/44193 (Set: 5 december 2025).