Gaya APA

AASHTO, . (2004). AASHTO M 207-04 , ASTM C 507-02 Standard Specification for Reinforced Concrete Elliptical Culvert, Storm Drain, and Sewer Pipe . : s.n..

Gaya MLA

AASHTO, . "AASHTO M 207-04 , ASTM C 507-02 Standard Specification for Reinforced Concrete Elliptical Culvert, Storm Drain, and Sewer Pipe". : s.n., 2004. Diorama.