APA
National Coal Board Mining Department, . (1975). Subsidence engineers handbook. London: National Coal Board.
Chicago
National Coal Board Mining Department, . 1975. Subsidence engineers handbook. London: National Coal Board.
Harvard
National Coal Board Mining Department, . (1975). Subsidence engineers handbook. London: National Coal Board.
MLA
National Coal Board Mining Department, . Subsidence engineers handbook. London: National Coal Board. 1975.