ASTM Committee D-18 on Soil and Rock for Engineering Purposes. (1970). Special procedures for testing soil and rock for engineering purposes (5th ed.). American Society for Testing and Materials.
Lua i Stíl Chicago (17ú heag.)ASTM Committee D-18 on Soil and Rock for Engineering Purposes. Special Procedures for Testing Soil and Rock for Engineering Purposes. 5th ed. Philadelphia: American Society for Testing and Materials, 1970.
Lua MLA (9ú heag.)ASTM Committee D-18 on Soil and Rock for Engineering Purposes. Special Procedures for Testing Soil and Rock for Engineering Purposes. 5th ed. American Society for Testing and Materials, 1970.
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