Borela, V., M. Ancheta, J.M., Bejar, J.C.P. and Garcia, L.M.L. 2021. The use of Polystyrene from Ballpen Barrels and Wood Ash as Additives in Making Lightweight Bricks. Journal La Multiapp. 2, 1 (Mar. 2021), 13-19. DOI:https://doi.org/10.37899/journallamultiapp.v2i1.208.