British Standards Institution. (1990). British standard methods of test for soils for civil engineering purposes: Part 9 : in-situ tests. British Standards Institution.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रBritish Standards Institution. British Standard Methods of Test for Soils for Civil Engineering Purposes: Part 9 : In-situ Tests. London: British Standards Institution, 1990.
एमएलए (8वां संस्करण) प्रशस्ति पत्रBritish Standards Institution. British Standard Methods of Test for Soils for Civil Engineering Purposes: Part 9 : In-situ Tests. British Standards Institution, 1990.
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