Gaya APA
ASTM, . (1997).
ASTM C 869 - 91 Standard specification for foaming agents used in making preformed foam for cellular concrete .
:
ASTM.
Gaya MLA
ASTM, .
"ASTM C 869 - 91 Standard specification for foaming agents used in making preformed foam for cellular concrete".
:
ASTM,
1997.
Diorama.