Gaya APA
ASTM, . (2006).
ASTM D 6430 - 99 (Reapproved 2005) Standard guide for using the gravity method for subsurface investigation .
:
ASTM.
Gaya MLA
ASTM, .
"ASTM D 6430 - 99 (Reapproved 2005) Standard guide for using the gravity method for subsurface investigation".
:
ASTM,
2006.
Diorama.