Gaya APA

ASTM, . (1997). ASTM D 2487 - 93 ; ASTM D 2487 - 00 Standard classification of soils for engineering purposes (United soil classification system) . : ASTM.

Gaya MLA

ASTM, . "ASTM D 2487 - 93 ; ASTM D 2487 - 00 Standard classification of soils for engineering purposes (United soil classification system)". : ASTM, 1997. Diorama.