Gaya APA
AASHTO, . (2004).
AASHTO M 176M-98 (2002) , ASTM C 654M 99 Standard Specification for Porous Concrete Pipe (Metric) .
:
s.n..
Gaya MLA
AASHTO, .
"AASHTO M 176M-98 (2002) , ASTM C 654M 99 Standard Specification for Porous Concrete Pipe (Metric)".
:
s.n.,
2004.
Diorama.