Frederiksen, P. (1985) “Pedogenesis and soil taxonomy. 1: Concepts and interactions/ ed. by L. P. Wilding, N. E. Smeck and G. F. Hall. - (Developments in soil science; 11 A). Pedogenesis and soil taxonomy. 2: The soil orders/ ed. by L. P. Wilding, N. E. Smeck and G. F. Hall. - (Developments in soil science; 11B)”., Geografisk Tidsskrift, 85. Tilgængelig hos: https://tidsskrift.dk/geografisktidsskrift/article/view/44123 (Set: 25 december 2025).