Lua APA (7ú heag.)

HOLTZ, R. D., & KOVACS, W. D. (1981). An introduction to geotechnical engineering. Prentice-hall.

Lua i Stíl Chicago (17ú heag.)

HOLTZ, Robert D., agus William D. KOVACS. An Introduction to Geotechnical Engineering. New Jersey: Prentice-hall, 1981.

Lua MLA (9ú heag.)

HOLTZ, Robert D., agus William D. KOVACS. An Introduction to Geotechnical Engineering. Prentice-hall, 1981.

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