@book{99969,
	author = {ASTM International},
	title = {Standard test method for density, absorption and voids in hardened concrete /},
	publisher = {ASTM International,},
	year = {2021},
	series = {C642-21},
	address = {United States :},
	url = {http://ecollib.ump.edu.my.libraryumpsa.idm.oclc.org/50576/}
}