APA
Indian Standards Institution, . (1981). Specification for split spoon sampler IS:9640-1980. New Delhi: Indian Standards Institution.
Chicago
Indian Standards Institution, . 1981. Specification for split spoon sampler IS:9640-1980. New Delhi: Indian Standards Institution.
Harvard
Indian Standards Institution, . (1981). Specification for split spoon sampler IS:9640-1980. New Delhi: Indian Standards Institution.
MLA
Indian Standards Institution, . Specification for split spoon sampler IS:9640-1980. New Delhi: Indian Standards Institution. 1981.
