Gaya APA
AASHTO, . (2004).
AASHTO M 175-97 (2001) , ASTM C 444-95 Standard Specification for Perforated Concrete Pipe .
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s.n..
Gaya MLA
AASHTO, .
"AASHTO M 175-97 (2001) , ASTM C 444-95 Standard Specification for Perforated Concrete Pipe".
:
s.n.,
2004.
Diorama.