Toh, H. S. (1991). Economics of pipe jacking method for installation of sewer.
Chicago Style (17th ed.) CitationToh, Hung Seng. Economics of Pipe Jacking Method for Installation of Sewer. 1991.
MLA引文Toh, Hung Seng. Economics of Pipe Jacking Method for Installation of Sewer. 1991.
警告：这些引文格式不一定是100％准确.