APA
Irvine D., Smith R. & Construction Industry Research and Information Association. (1992). Trenching practice. London: CIRIA.
Chicago
Irvine D.J, Smith R.J.H and Construction Industry Research and Information Association. 1992. Trenching practice. London: CIRIA.
Harvard
Irvine D., Smith R. and Construction Industry Research and Information Association. (1992). Trenching practice. London: CIRIA.
MLA
Irvine D.J, Smith R.J.H and Construction Industry Research and Information Association. Trenching practice. London: CIRIA. 1992.