Passfield, Robert W (2007). "Philip Louis Pratley (1884-1958): bridge design engineer". Canadian Journal of Civil Engineering. 34 (5). National Research Council of Canada: 637–650. doi:10.1139/l06-130.
Passfield, Robert W. (2007). "Philip Louis Pratley (1884-1958): Bridge design engineer". Canadian Journal of Civil Engineering. 34 (5): 637–650. doi:10.1139/l06-130.