Tohutoro APA (7th ed.)
Das, B. M. (2004). Principles of foundation engineering (5th ed.). Thomson.
Tohutoru Kātū Chicago (17th ed.)
Das, Braja M. Principles of Foundation Engineering. 5th ed. Singapore: Thomson, 2004.
Tohutoro MLA (9th ed.)
Das, Braja M. Principles of Foundation Engineering. 5th ed. Thomson, 2004.
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