OBLA, K. H. (2015). Improving concrete quality. CRC Press.
Lua i Stíl Chicago (17ú heag.)OBLA, Karthikeyan H. Improving Concrete Quality. CRC Press, 2015.
Lua MLA (9ú heag.)OBLA, Karthikeyan H. Improving Concrete Quality. CRC Press, 2015.
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