Holtz, W. G. (1969). Soil as an engineering material. United States Department of the Interior.
Chicago-Zitierstil (17. Ausg.)Holtz, Wesley G. Soil as an Engineering Material. Washington, D.C: United States Department of the Interior, 1969.
MLA-Zitierstil (9. Ausg.)Holtz, Wesley G. Soil as an Engineering Material. United States Department of the Interior, 1969.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.