(19) Methods of Soil Analysis (1986). Part 1, Physical and Mineralogical Methods. Vyd. A. Klute, Agronomy Series No 9, 2. vydání.
(19) Methods of Soil Analysis (1986). Part 1, Physical and Mineralogical Methods. Vyd. A. Klute, Agronomy Series No 9, 2. vydání.