British Standards Institution. (1990). British standard methods of test for soils for civil engineering purposes: Part 9 : in-situ tests. British Standards Institution.
Chicago-referens (17:e uppl.)British Standards Institution. British Standard Methods of Test for Soils for Civil Engineering Purposes: Part 9 : In-situ Tests. London: British Standards Institution, 1990.
MLA-referens (8:e uppl.)British Standards Institution. British Standard Methods of Test for Soils for Civil Engineering Purposes: Part 9 : In-situ Tests. British Standards Institution, 1990.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.