Gaya APA
ASTM, . (1997).
ASTM D 2823 - 90 ; ASTM D 2823 - 90 (Reapproved 1997) Standard specification for asphalt roof coatings .
:
ASTM.
Gaya MLA
ASTM, .
"ASTM D 2823 - 90 ; ASTM D 2823 - 90 (Reapproved 1997) Standard specification for asphalt roof coatings".
:
ASTM,
1997.
Diorama.