Gaya APA
AASHTO, . (2008).
AASHTO M 20 - 70 (2004) Standard specification for penetration graded asphalt cement .
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AASHTO.
Gaya MLA
AASHTO, .
"AASHTO M 20 - 70 (2004) Standard specification for penetration graded asphalt cement".
:
AASHTO,
2008.
Diorama.