Breuning Madsen, H. (1981) “H. de Bakker: MAJOR SOILS AND SOIL REGIONS IN THE NETHERLANDS Centre for agricultural publishing and documentation, Wageningen 1979, 203 s., ill., 25 cm, Dfl. 100,-”., Geografisk Tidsskrift, 81. Tilgængelig hos: https://tidsskrift.dk/geografisktidsskrift/article/view/45155 (Set: 7 december 2025).