Siswanto, Roby, 		Suyoso, Hernu, AND 		Hayu, Gati.
"THE EFFECT OF THE USE OF BEACH SAND AS FINE AGGREGATE AND SHELLS AS CEMENT PARTIAL SUBTITUTION TOWARDS COMPRESSIVE STRENGTH OF CONCRETE" <em>Jurnal Rekayasa Sipil dan Lingkungan</em> [Online], Volume 1 Number 02 (8 December 2017)