Jones, Reginald Victor (1978). "The Wizard War: British Scientific Intelligence, 1939–1945". Coward, McCann & Geoghegan. ISBN9780698108967.Tidak memiliki atau membutuhkan |url= (bantuan)
Robertson, H. P. (1928). "Bemerkung über separierbare Systeme in der Wellenmechanik". Mathematische Annalen (dalam bahasa German). 98 (1): 749–752. doi:10.1007/BF01451624. ISSN0025-5831.Pemeliharaan CS1: Bahasa yang tidak diketahui (link)
Robertson, H. P. (1928). "On Relativistic Cosmology". The London, Edinburgh, and Dublin Philosophical Magazine and Journal of Science. 7. 5 (31): 835–848. doi:10.1080/14786440508564528.
Robertson, H. P. (April 1937). "Dynamical effects of radiation in the solar system". Monthly Notices of the Royal Astronomical Society. Royal Astronomical Society. 97: 423–438. Bibcode:1937MNRAS..97..423R. doi:10.1093/mnras/97.6.423.
Robertson, H. P. (1938). "Note on the preceding paper: The two body problem in general relativity". The Annals of Mathematics. 2. 39: 101–104. doi:10.2307/1968715. ISSN0003-486X.
Society for Industrial and Applied Mathematics (December 1962). "H. P. Robertson: 1903–1961". Journal of the Society for Industrial and Applied Mathematics. 10 (4): 741–750. JSTOR2098919.