Gaya APA
ASTM, . (1997).
ASTM C 823 - 95 Standard practice for examination and sampling of hardened concrete in construction .
:
ASTM.
Gaya MLA
ASTM, .
"ASTM C 823 - 95 Standard practice for examination and sampling of hardened concrete in construction".
:
ASTM,
1997.
Diorama.