Indian standards institution . ISI. (1981). Specification for pre-cast concrete septic tanks, IS: 9872-1981. ISI.
Chicago Edition CitationIndian standards institution . ISI. Specification for Pre-cast Concrete Septic Tanks, IS: 9872-1981. : ISI, 1981.
MLA Edition CitationIndian standards institution . ISI. Specification for Pre-cast Concrete Septic Tanks, IS: 9872-1981. ISI, 1981.