Lyford, W. H., & Troedsson, T. (1973). Fragipan horizons in soils on moraines near Garpenberg, Sweden =: "Fragipan"-horisonter i moränen i Garpenberg. Royal College of Forestry.
Citace podle Chicago (17th ed.)Lyford, Walter Henry, a Tryggve Troedsson. Fragipan Horizons in Soils on Moraines Near Garpenberg, Sweden =: "Fragipan"-horisonter I Moränen I Garpenberg. Stockholm: Royal College of Forestry, 1973.
Citace podle MLA (8th ed.)Lyford, Walter Henry, a Tryggve Troedsson. Fragipan Horizons in Soils on Moraines Near Garpenberg, Sweden =: "Fragipan"-horisonter I Moränen I Garpenberg. Royal College of Forestry, 1973.
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