United States Department of Agriculture, & Natural Resources Conservation Service. (1995). Soil survey laboratory information manual. Lincoln: National Soil Survey Center.
Stile di citazione ChicagoUnited States Department of Agriculture, e Natural Resources Conservation Service. Soil Survey Laboratory Information Manual. Lincoln: National Soil Survey Center, 1995.
Citazione MLAUnited States Department of Agriculture, e Natural Resources Conservation Service. Soil Survey Laboratory Information Manual. Lincoln: National Soil Survey Center, 1995.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.