Roy, A., Moelders, N., & Schilling, P. J. (2006). Role of an Amorphous Silica in Portland Cement Concrete. Journal of Materials in Civil Engineering, 18(6), 747. https://doi.org/10.1061/(ASCE)0899-1561(2006)18:6(747)
Chicago Style (17th ed.) CitationRoy, Amitava, Nicholas Moelders, and Paul J. Schilling. "Role of an Amorphous Silica in Portland Cement Concrete." Journal of Materials in Civil Engineering 18, no. 6 (2006): 747. https://doi.org/10.1061/(ASCE)0899-1561(2006)18:6(747).
MLA (9th ed.) CitationRoy, Amitava, et al. "Role of an Amorphous Silica in Portland Cement Concrete." Journal of Materials in Civil Engineering, vol. 18, no. 6, 2006, p. 747, https://doi.org/10.1061/(ASCE)0899-1561(2006)18:6(747).
Warning: These citations may not always be 100% accurate.