(52) Black, Evans D. D., White J. L., Ensminger L. E., Clark F.E., eds. „Methods of Soil Analysis“, Vol 1 a 2, American Society of Agronomy, Madison, WI, 1982.
(52) Black, Evans D. D., White J. L., Ensminger L. E., Clark F.E., eds. „Methods of Soil Analysis“, Vol 1 a 2, American Society of Agronomy, Madison, WI, 1982.