Portland Cement Association. (1975). Concrete culverts and conduits. Portland Cement Association.
Chicago Style (17th ed.) CitationPortland Cement Association. Concrete Culverts and Conduits. Skokie, Ill.: Portland Cement Association, 1975.
MLA (9th ed.) CitationPortland Cement Association. Concrete Culverts and Conduits. Portland Cement Association, 1975.
Warning: These citations may not always be 100% accurate.