Butler, D., & Pinkerton, B. R. C. (1987). Gravity flow pipe design charts. Thomas Telford.
Chicago Style (17th ed.) CitationButler, David, and Brian R. C. Pinkerton. Gravity Flow Pipe Design Charts. London: Thomas Telford, 1987.
MLA (9th ed.) CitationButler, David, and Brian R. C. Pinkerton. Gravity Flow Pipe Design Charts. Thomas Telford, 1987.
Warning: These citations may not always be 100% accurate.