Gaya APA
AASHTO, . (2004).
AASHTO m 175M - 97 (2001); ASTM C 444 M - 95 Standard specification for perforated concrete pipe (metric) .
:
AASHTO.
Gaya MLA
AASHTO, .
"AASHTO m 175M - 97 (2001); ASTM C 444 M - 95 Standard specification for perforated concrete pipe (metric)".
:
AASHTO,
2004.
Diorama.