Gaya APA

ASTM, . (2006). ASTM D 6431 - 99 ( Reapproved 2005) Standard guide for using the direct current resistivity method for subsurface investigation . : ASTM.

Gaya MLA

ASTM, . "ASTM D 6431 - 99 ( Reapproved 2005) Standard guide for using the direct current resistivity method for subsurface investigation". : ASTM, 2006. Diorama.