APA
Indian Standards Institution, . (1980). Code of practice for sub surface exploration by pits, trenches, drifts and shafts, IS 4453-1980. New Delhi: Indian Standards Institution.
Chicago
Indian Standards Institution, . 1980. Code of practice for sub surface exploration by pits, trenches, drifts and shafts, IS 4453-1980. New Delhi: Indian Standards Institution.
Harvard
Indian Standards Institution, . (1980). Code of practice for sub surface exploration by pits, trenches, drifts and shafts, IS 4453-1980. New Delhi: Indian Standards Institution.
MLA
Indian Standards Institution, . Code of practice for sub surface exploration by pits, trenches, drifts and shafts, IS 4453-1980. New Delhi: Indian Standards Institution. 1980.
