Sir Ralph Freeman

1. Sir Ralph Freeman, 1880-1950. In: Journal of the Institution of Civil Engineers, v. 34, n. 7 (Mai 1950), S. 276.

   https://doi.org/10.1680/ijoti.1950.12891

2. Freeman, Ralph Anthony (1934): Sydney Harbour Bridge: Design of the Structure and Foundations. In: Minutes of the Proceedings of the Institution of Civil Engineers, v. 238, n. 1934-2 ( 1934), S. 153-193, photographs, plates.

   https://doi.org/10.1680/imotp.1934.15302