WIEGEL, R. L., & WIEGEL, R. L. Earthquake Engineering Robert L. Wiegel. Prentice-Hall.
Lua i Stíl Chicago (17ú heag.)WIEGEL, Robert L., agus Robert L. WIEGEL. Earthquake Engineering Robert L. Wiegel. Prentice-Hall.
Lua MLA (8ú heag.)WIEGEL, Robert L., agus Robert L. WIEGEL. Earthquake Engineering Robert L. Wiegel. Prentice-Hall.
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