Strack, O. D. L. (1989). Groundwater mechanics. Prentice Hall.
Lua i Stíl Chicago (17ú heag.)Strack, Otto D. L. Groundwater Mechanics. Englewood Cliffs, N.J: Prentice Hall, 1989.
Lua MLA (9ú heag.)Strack, Otto D. L. Groundwater Mechanics. Prentice Hall, 1989.
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