Holtz, W. G. (1969). Soil as an engineering material. United States Department of the Interior.
Citace podle Chicago (17th ed.)Holtz, Wesley G. Soil as an Engineering Material. Washington, D.C: United States Department of the Interior, 1969.
Citace podle MLA (9th ed.)Holtz, Wesley G. Soil as an Engineering Material. United States Department of the Interior, 1969.
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