Gaya APA
AASHTO, . (2004).
AASHTO M 176 - 98 (2002); ASTM C 654 M - 99 Standard specification for porous concrete pipe (metric) .
:
AASHTO.
Gaya MLA
AASHTO, .
"AASHTO M 176 - 98 (2002); ASTM C 654 M - 99 Standard specification for porous concrete pipe (metric)".
:
AASHTO,
2004.
Diorama.