Gaya APA
AASHTO, . (2008).
AASHTO M 176 - 07; ASTM C 654 - 5a and C 654-05a Standard specification for porous concrete pipe .
:
AASHTO.
Gaya MLA
AASHTO, .
"AASHTO M 176 - 07; ASTM C 654 - 5a and C 654-05a Standard specification for porous concrete pipe".
:
AASHTO,
2008.
Diorama.