Indian standards institution . ISI. (1984). Specification for equipment for sub-surfsce sounding of soils IS: 10589-1983 (1.). Indian standards institution.
Chicago-stil citatIndian standards institution . ISI. Specification for Equipment for Sub-surfsce Sounding of Soils IS: 10589-1983. 1. New Delhi: Indian standards institution, 1984.
MLA-referensIndian standards institution . ISI. Specification for Equipment for Sub-surfsce Sounding of Soils IS: 10589-1983. 1. Indian standards institution, 1984.